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make generic_acl slightly more generic
Now that we cache the ACL pointers in the generic inode all the generic_acl cruft can go away and generic_acl.c can directly implement xattr handlers dealing with the full Posix ACL semantics for in-memory filesystems. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Christoph Hellwig
Al Viro
parent
431547b3c4
commit
1c7c474c31
6 changed files with 109 additions and 257 deletions
108
fs/generic_acl.c
108
fs/generic_acl.c
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@ -1,62 +1,58 @@
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/*
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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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* Generic ACL support for in-memory filesystems.
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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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#include <linux/posix_acl.h>
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#include <linux/posix_acl_xattr.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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static size_t
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generic_acl_list(struct dentry *dentry, char *list, size_t list_size,
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const char *name, size_t name_len, int type)
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{
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struct posix_acl *acl;
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const char *name;
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const char *xname;
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size_t size;
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acl = ops->getacl(inode, type);
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acl = get_cached_acl(dentry->d_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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xname = 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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xname = 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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size = strlen(xname) + 1;
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if (list && size <= list_size)
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memcpy(list, name, size);
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memcpy(list, xname, 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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static int
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generic_acl_get(struct dentry *dentry, const char *name, void *buffer,
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size_t size, int type)
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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 (strcmp(name, "") != 0)
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return -EINVAL;
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acl = get_cached_acl(dentry->d_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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@ -65,17 +61,16 @@ generic_acl_get(struct inode *inode, struct generic_acl_operations *ops,
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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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static int
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generic_acl_set(struct dentry *dentry, const char *name, const void *value,
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size_t size, int flags, int type)
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{
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struct inode *inode = dentry->d_inode;
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struct posix_acl *acl = NULL;
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int error;
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if (strcmp(name, "") != 0)
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return -EINVAL;
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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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@ -103,7 +98,6 @@ generic_acl_set(struct inode *inode, struct generic_acl_operations *ops,
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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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@ -112,7 +106,7 @@ generic_acl_set(struct inode *inode, struct generic_acl_operations *ops,
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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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set_cached_acl(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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@ -121,14 +115,12 @@ failed:
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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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generic_acl_init(struct inode *inode, struct inode *dir)
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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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@ -136,7 +128,7 @@ generic_acl_init(struct inode *inode, struct inode *dir,
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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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acl = get_cached_acl(dir, ACL_TYPE_DEFAULT);
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if (acl) {
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struct posix_acl *clone;
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@ -145,7 +137,7 @@ generic_acl_init(struct inode *inode, struct inode *dir,
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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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set_cached_acl(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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@ -156,7 +148,7 @@ generic_acl_init(struct inode *inode, struct inode *dir,
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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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set_cached_acl(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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@ -169,20 +161,19 @@ cleanup:
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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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generic_acl_chmod(struct inode *inode)
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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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acl = get_cached_acl(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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@ -190,8 +181,37 @@ generic_acl_chmod(struct inode *inode, struct generic_acl_operations *ops)
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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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set_cached_acl(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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int
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generic_check_acl(struct inode *inode, int mask)
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{
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struct posix_acl *acl = get_cached_acl(inode, ACL_TYPE_ACCESS);
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if (acl) {
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int error = posix_acl_permission(inode, acl, mask);
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posix_acl_release(acl);
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return error;
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}
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return -EAGAIN;
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}
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struct xattr_handler generic_acl_access_handler = {
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.prefix = POSIX_ACL_XATTR_ACCESS,
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.flags = ACL_TYPE_ACCESS,
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.list = generic_acl_list,
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.get = generic_acl_get,
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.set = generic_acl_set,
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};
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struct xattr_handler generic_acl_default_handler = {
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.prefix = POSIX_ACL_XATTR_DEFAULT,
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.flags = ACL_TYPE_DEFAULT,
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.list = generic_acl_list,
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.get = generic_acl_get,
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.set = generic_acl_set,
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};
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@ -1,36 +1,15 @@
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/*
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* include/linux/generic_acl.h
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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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#ifndef LINUX_GENERIC_ACL_H
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#define LINUX_GENERIC_ACL_H
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#ifndef GENERIC_ACL_H
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#define GENERIC_ACL_H
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#include <linux/xattr.h>
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#include <linux/posix_acl.h>
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#include <linux/posix_acl_xattr.h>
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struct inode;
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/**
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* struct generic_acl_operations - filesystem operations
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*
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* Filesystems must make these operations available to the generic
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* operations.
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*/
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struct generic_acl_operations {
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struct posix_acl *(*getacl)(struct inode *, int);
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void (*setacl)(struct inode *, int, struct posix_acl *);
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};
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extern struct xattr_handler generic_acl_access_handler;
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extern struct xattr_handler generic_acl_default_handler;
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size_t generic_acl_list(struct inode *, struct generic_acl_operations *, int,
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char *, size_t);
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int generic_acl_get(struct inode *, struct generic_acl_operations *, int,
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void *, size_t);
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int generic_acl_set(struct inode *, struct generic_acl_operations *, int,
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const void *, size_t);
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int generic_acl_init(struct inode *, struct inode *,
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struct generic_acl_operations *);
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int generic_acl_chmod(struct inode *, struct generic_acl_operations *);
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int generic_acl_init(struct inode *, struct inode *);
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int generic_acl_chmod(struct inode *);
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int generic_check_acl(struct inode *inode, int mask);
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#endif
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#endif /* LINUX_GENERIC_ACL_H */
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@ -41,20 +41,4 @@ static inline struct shmem_inode_info *SHMEM_I(struct inode *inode)
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extern int init_tmpfs(void);
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extern int shmem_fill_super(struct super_block *sb, void *data, int silent);
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#ifdef CONFIG_TMPFS_POSIX_ACL
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int shmem_check_acl(struct inode *, int);
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int shmem_acl_init(struct inode *, struct inode *);
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extern struct xattr_handler shmem_xattr_acl_access_handler;
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extern struct xattr_handler shmem_xattr_acl_default_handler;
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extern struct generic_acl_operations shmem_acl_ops;
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#else
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static inline int shmem_acl_init(struct inode *inode, struct inode *dir)
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{
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return 0;
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}
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#endif /* CONFIG_TMPFS_POSIX_ACL */
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#endif
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@ -22,7 +22,6 @@ obj-$(CONFIG_HUGETLBFS) += hugetlb.o
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obj-$(CONFIG_NUMA) += mempolicy.o
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obj-$(CONFIG_SPARSEMEM) += sparse.o
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obj-$(CONFIG_SPARSEMEM_VMEMMAP) += sparse-vmemmap.o
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obj-$(CONFIG_TMPFS_POSIX_ACL) += shmem_acl.o
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obj-$(CONFIG_SLOB) += slob.o
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obj-$(CONFIG_MMU_NOTIFIER) += mmu_notifier.o
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obj-$(CONFIG_KSM) += ksm.o
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17
mm/shmem.c
17
mm/shmem.c
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@ -41,6 +41,7 @@ static struct vfsmount *shm_mnt;
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#include <linux/xattr.h>
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#include <linux/exportfs.h>
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#include <linux/posix_acl.h>
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#include <linux/generic_acl.h>
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#include <linux/mman.h>
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#include <linux/string.h>
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@ -809,7 +810,7 @@ static int shmem_notify_change(struct dentry *dentry, struct iattr *attr)
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error = inode_setattr(inode, attr);
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#ifdef CONFIG_TMPFS_POSIX_ACL
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if (!error && (attr->ia_valid & ATTR_MODE))
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error = generic_acl_chmod(inode, &shmem_acl_ops);
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error = generic_acl_chmod(inode);
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#endif
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if (page)
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page_cache_release(page);
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@ -1823,11 +1824,13 @@ shmem_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t dev)
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return error;
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}
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}
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error = shmem_acl_init(inode, dir);
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#ifdef CONFIG_TMPFS_POSIX_ACL
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error = generic_acl_init(inode, dir);
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if (error) {
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iput(inode);
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return error;
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}
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#endif
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if (dir->i_mode & S_ISGID) {
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inode->i_gid = dir->i_gid;
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if (S_ISDIR(mode))
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@ -2074,8 +2077,8 @@ static struct xattr_handler shmem_xattr_security_handler = {
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};
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static struct xattr_handler *shmem_xattr_handlers[] = {
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&shmem_xattr_acl_access_handler,
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&shmem_xattr_acl_default_handler,
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&generic_acl_access_handler,
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&generic_acl_default_handler,
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&shmem_xattr_security_handler,
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NULL
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};
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@ -2454,7 +2457,7 @@ static const struct inode_operations shmem_inode_operations = {
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.getxattr = generic_getxattr,
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.listxattr = generic_listxattr,
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.removexattr = generic_removexattr,
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.check_acl = shmem_check_acl,
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.check_acl = generic_check_acl,
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#endif
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};
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@ -2477,7 +2480,7 @@ static const struct inode_operations shmem_dir_inode_operations = {
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.getxattr = generic_getxattr,
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.listxattr = generic_listxattr,
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.removexattr = generic_removexattr,
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.check_acl = shmem_check_acl,
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.check_acl = generic_check_acl,
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#endif
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};
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@ -2488,7 +2491,7 @@ static const struct inode_operations shmem_special_inode_operations = {
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.getxattr = generic_getxattr,
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.listxattr = generic_listxattr,
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.removexattr = generic_removexattr,
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.check_acl = shmem_check_acl,
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.check_acl = generic_check_acl,
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#endif
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};
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|
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133
mm/shmem_acl.c
133
mm/shmem_acl.c
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@ -1,133 +0,0 @@
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/*
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* mm/shmem_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/fs.h>
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#include <linux/shmem_fs.h>
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#include <linux/xattr.h>
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#include <linux/generic_acl.h>
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/**
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* shmem_get_acl - generic_acl_operations->getacl() operation
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*/
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static struct posix_acl *
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shmem_get_acl(struct inode *inode, int type)
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{
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struct posix_acl *acl = NULL;
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spin_lock(&inode->i_lock);
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switch(type) {
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case ACL_TYPE_ACCESS:
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acl = posix_acl_dup(inode->i_acl);
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break;
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case ACL_TYPE_DEFAULT:
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acl = posix_acl_dup(inode->i_default_acl);
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break;
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}
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spin_unlock(&inode->i_lock);
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return acl;
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}
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/**
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* shmem_set_acl - generic_acl_operations->setacl() operation
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*/
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static void
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shmem_set_acl(struct inode *inode, int type, struct posix_acl *acl)
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{
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struct posix_acl *free = NULL;
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spin_lock(&inode->i_lock);
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switch(type) {
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case ACL_TYPE_ACCESS:
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free = inode->i_acl;
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inode->i_acl = posix_acl_dup(acl);
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break;
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case ACL_TYPE_DEFAULT:
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free = inode->i_default_acl;
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inode->i_default_acl = posix_acl_dup(acl);
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break;
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}
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spin_unlock(&inode->i_lock);
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posix_acl_release(free);
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}
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struct generic_acl_operations shmem_acl_ops = {
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.getacl = shmem_get_acl,
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.setacl = shmem_set_acl,
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};
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static size_t
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shmem_xattr_list_acl(struct dentry *dentry, char *list, size_t list_size,
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const char *name, size_t name_len, int type)
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{
|
||||
return generic_acl_list(dentry->d_inode, &shmem_acl_ops,
|
||||
type, list, list_size);
|
||||
}
|
||||
|
||||
static int
|
||||
shmem_xattr_get_acl(struct dentry *dentry, const char *name, void *buffer,
|
||||
size_t size, int type)
|
||||
{
|
||||
if (strcmp(name, "") != 0)
|
||||
return -EINVAL;
|
||||
return generic_acl_get(dentry->d_inode, &shmem_acl_ops, type,
|
||||
buffer, size);
|
||||
}
|
||||
|
||||
static int
|
||||
shmem_xattr_set_acl(struct dentry *dentry, const char *name, const void *value,
|
||||
size_t size, int flags, int type)
|
||||
{
|
||||
if (strcmp(name, "") != 0)
|
||||
return -EINVAL;
|
||||
return generic_acl_set(dentry->d_inode, &shmem_acl_ops, type,
|
||||
value, size);
|
||||
}
|
||||
|
||||
struct xattr_handler shmem_xattr_acl_access_handler = {
|
||||
.prefix = POSIX_ACL_XATTR_ACCESS,
|
||||
.flags = ACL_TYPE_ACCESS,
|
||||
.list = shmem_xattr_list_acl,
|
||||
.get = shmem_xattr_get_acl,
|
||||
.set = shmem_xattr_set_acl,
|
||||
};
|
||||
|
||||
struct xattr_handler shmem_xattr_acl_default_handler = {
|
||||
.prefix = POSIX_ACL_XATTR_DEFAULT,
|
||||
.flags = ACL_TYPE_DEFAULT,
|
||||
.list = shmem_xattr_list_acl,
|
||||
.get = shmem_xattr_get_acl,
|
||||
.set = shmem_xattr_set_acl,
|
||||
};
|
||||
|
||||
/**
|
||||
* shmem_acl_init - Inizialize the acl(s) of a new inode
|
||||
*/
|
||||
int
|
||||
shmem_acl_init(struct inode *inode, struct inode *dir)
|
||||
{
|
||||
return generic_acl_init(inode, dir, &shmem_acl_ops);
|
||||
}
|
||||
|
||||
/**
|
||||
* shmem_check_acl - check_acl() callback for generic_permission()
|
||||
*/
|
||||
int
|
||||
shmem_check_acl(struct inode *inode, int mask)
|
||||
{
|
||||
struct posix_acl *acl = shmem_get_acl(inode, ACL_TYPE_ACCESS);
|
||||
|
||||
if (acl) {
|
||||
int error = posix_acl_permission(inode, acl, mask);
|
||||
posix_acl_release(acl);
|
||||
return error;
|
||||
}
|
||||
return -EAGAIN;
|
||||
}
|
||||
Loading…
Reference in a new issue