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@xxxxxx>
Index: linux-2.6/fs/generic_acl.c
===================================================================
--- linux-2.6.orig/fs/generic_acl.c 2009-09-23 10:01:18.480278413 -0300
+++ linux-2.6/fs/generic_acl.c 2009-09-26 11:54:15.159003290 -0300
@@ -1,62 +1,58 @@
/*
- * fs/generic_acl.c
- *
* (C) 2005 Andreas Gruenbacher <agruen@xxxxxxx>
*
* This file is released under the GPL.
+ *
+ * Generic ACL support for in-memory filesystems.
*/
#include <linux/sched.h>
#include <linux/fs.h>
#include <linux/generic_acl.h>
+#include <linux/posix_acl.h>
+#include <linux/posix_acl_xattr.h>
-/**
- * generic_acl_list - Generic xattr_handler->list() operation
- * @ops: Filesystem specific getacl and setacl callbacks
- */
-size_t
-generic_acl_list(struct inode *inode, struct generic_acl_operations *ops,
- int type, char *list, size_t list_size)
+
+static size_t
+generic_acl_list(struct dentry *dentry, char *list, size_t list_size,
+ const char *name, size_t name_len, int type)
{
struct posix_acl *acl;
- const char *name;
+ const char *xname;
size_t size;
- acl = ops->getacl(inode, type);
+ acl = get_cached_acl(dentry->d_inode, type);
if (!acl)
return 0;
posix_acl_release(acl);
- switch(type) {
- case ACL_TYPE_ACCESS:
- name = POSIX_ACL_XATTR_ACCESS;
- break;
-
- case ACL_TYPE_DEFAULT:
- name = POSIX_ACL_XATTR_DEFAULT;
- break;
-
- default:
- return 0;
+ switch (type) {
+ case ACL_TYPE_ACCESS:
+ xname = POSIX_ACL_XATTR_ACCESS;
+ break;
+ case ACL_TYPE_DEFAULT:
+ xname = POSIX_ACL_XATTR_DEFAULT;
+ break;
+ default:
+ return 0;
}
- size = strlen(name) + 1;
+ size = strlen(xname) + 1;
if (list && size <= list_size)
- memcpy(list, name, size);
+ memcpy(list, xname, size);
return size;
}
-/**
- * generic_acl_get - Generic xattr_handler->get() operation
- * @ops: Filesystem specific getacl and setacl callbacks
- */
-int
-generic_acl_get(struct inode *inode, struct generic_acl_operations *ops,
- int type, void *buffer, size_t size)
+static int
+generic_acl_get(struct dentry *dentry, const char *name, void *buffer,
+ size_t size, int type)
{
struct posix_acl *acl;
int error;
- acl = ops->getacl(inode, type);
+ if (strcmp(name, "") != 0)
+ return -EINVAL;
+
+ acl = get_cached_acl(dentry->d_inode, type);
if (!acl)
return -ENODATA;
error = posix_acl_to_xattr(acl, buffer, size);
@@ -65,17 +61,16 @@ generic_acl_get(struct inode *inode, str
return error;
}
-/**
- * generic_acl_set - Generic xattr_handler->set() operation
- * @ops: Filesystem specific getacl and setacl callbacks
- */
-int
-generic_acl_set(struct inode *inode, struct generic_acl_operations *ops,
- int type, const void *value, size_t size)
+static int
+generic_acl_set(struct dentry *dentry, const char *name, const void *value,
+ size_t size, int flags, int type)
{
+ struct inode *inode = dentry->d_inode;
struct posix_acl *acl = NULL;
int error;
+ if (strcmp(name, "") != 0)
+ return -EINVAL;
if (S_ISLNK(inode->i_mode))
return -EOPNOTSUPP;
if (!is_owner_or_cap(inode))
@@ -91,28 +86,27 @@ generic_acl_set(struct inode *inode, str
error = posix_acl_valid(acl);
if (error)
goto failed;
- switch(type) {
- case ACL_TYPE_ACCESS:
- mode = inode->i_mode;
- error = posix_acl_equiv_mode(acl, &mode);
- if (error < 0)
- goto failed;
- inode->i_mode = mode;
- if (error == 0) {
- posix_acl_release(acl);
- acl = NULL;
- }
- break;
-
- case ACL_TYPE_DEFAULT:
- if (!S_ISDIR(inode->i_mode)) {
- error = -EINVAL;
- goto failed;
- }
- break;
+ switch (type) {
+ case ACL_TYPE_ACCESS:
+ mode = inode->i_mode;
+ error = posix_acl_equiv_mode(acl, &mode);
+ if (error < 0)
+ goto failed;
+ inode->i_mode = mode;
+ if (error == 0) {
+ posix_acl_release(acl);
+ acl = NULL;
+ }
+ break;
+ case ACL_TYPE_DEFAULT:
+ if (!S_ISDIR(inode->i_mode)) {
+ error = -EINVAL;
+ goto failed;
+ }
+ break;
}
}
- ops->setacl(inode, type, acl);
+ set_cached_acl(inode, type, acl);
error = 0;
failed:
posix_acl_release(acl);
@@ -121,14 +115,12 @@ failed:
/**
* generic_acl_init - Take care of acl inheritance at @inode create time
- * @ops: Filesystem specific getacl and setacl callbacks
*
* Files created inside a directory with a default ACL inherit the
* directory's default ACL.
*/
int
-generic_acl_init(struct inode *inode, struct inode *dir,
- struct generic_acl_operations *ops)
+generic_acl_init(struct inode *inode, struct inode *dir)
{
struct posix_acl *acl = NULL;
mode_t mode = inode->i_mode;
@@ -136,7 +128,7 @@ generic_acl_init(struct inode *inode, st
inode->i_mode = mode & ~current_umask();
if (!S_ISLNK(inode->i_mode))
- acl = ops->getacl(dir, ACL_TYPE_DEFAULT);
+ acl = get_cached_acl(dir, ACL_TYPE_DEFAULT);
if (acl) {
struct posix_acl *clone;
@@ -145,7 +137,7 @@ generic_acl_init(struct inode *inode, st
error = -ENOMEM;
if (!clone)
goto cleanup;
- ops->setacl(inode, ACL_TYPE_DEFAULT, clone);
+ set_cached_acl(inode, ACL_TYPE_DEFAULT, clone);
posix_acl_release(clone);
}
clone = posix_acl_clone(acl, GFP_KERNEL);
@@ -156,7 +148,7 @@ generic_acl_init(struct inode *inode, st
if (error >= 0) {
inode->i_mode = mode;
if (error > 0)
- ops->setacl(inode, ACL_TYPE_ACCESS, clone);
+ set_cached_acl(inode, ACL_TYPE_ACCESS, clone);
}
posix_acl_release(clone);
}
@@ -169,20 +161,19 @@ cleanup:
/**
* generic_acl_chmod - change the access acl of @inode upon chmod()
- * @ops: FIlesystem specific getacl and setacl callbacks
*
* A chmod also changes the permissions of the owner, group/mask, and
* other ACL entries.
*/
int
-generic_acl_chmod(struct inode *inode, struct generic_acl_operations *ops)
+generic_acl_chmod(struct inode *inode)
{
struct posix_acl *acl, *clone;
int error = 0;
if (S_ISLNK(inode->i_mode))
return -EOPNOTSUPP;
- acl = ops->getacl(inode, ACL_TYPE_ACCESS);
+ acl = get_cached_acl(inode, ACL_TYPE_ACCESS);
if (acl) {
clone = posix_acl_clone(acl, GFP_KERNEL);
posix_acl_release(acl);
@@ -190,8 +181,37 @@ generic_acl_chmod(struct inode *inode, s
return -ENOMEM;
error = posix_acl_chmod_masq(clone, inode->i_mode);
if (!error)
- ops->setacl(inode, ACL_TYPE_ACCESS, clone);
+ set_cached_acl(inode, ACL_TYPE_ACCESS, clone);
posix_acl_release(clone);
}
return error;
}
+
+int
+generic_check_acl(struct inode *inode, int mask)
+{
+ struct posix_acl *acl = get_cached_acl(inode, ACL_TYPE_ACCESS);
+
+ if (acl) {
+ int error = posix_acl_permission(inode, acl, mask);
+ posix_acl_release(acl);
+ return error;
+ }
+ return -EAGAIN;
+}
+
+struct xattr_handler generic_acl_access_handler = {
+ .prefix = POSIX_ACL_XATTR_ACCESS,
+ .flags = ACL_TYPE_ACCESS,
+ .list = generic_acl_list,
+ .get = generic_acl_get,
+ .set = generic_acl_set,
+};
+
+struct xattr_handler generic_acl_default_handler = {
+ .prefix = POSIX_ACL_XATTR_DEFAULT,
+ .flags = ACL_TYPE_DEFAULT,
+ .list = generic_acl_list,
+ .get = generic_acl_get,
+ .set = generic_acl_set,
+};
Index: linux-2.6/include/linux/generic_acl.h
===================================================================
--- linux-2.6.orig/include/linux/generic_acl.h 2009-09-23 10:01:18.491253903 -0300
+++ linux-2.6/include/linux/generic_acl.h 2009-09-26 11:54:15.159003290 -0300
@@ -1,36 +1,15 @@
-/*
- * include/linux/generic_acl.h
- *
- * (C) 2005 Andreas Gruenbacher <agruen@xxxxxxx>
- *
- * This file is released under the GPL.
- */
+#ifndef LINUX_GENERIC_ACL_H
+#define LINUX_GENERIC_ACL_H
-#ifndef GENERIC_ACL_H
-#define GENERIC_ACL_H
+#include <linux/xattr.h>
-#include <linux/posix_acl.h>
-#include <linux/posix_acl_xattr.h>
+struct inode;
-/**
- * struct generic_acl_operations - filesystem operations
- *
- * Filesystems must make these operations available to the generic
- * operations.
- */
-struct generic_acl_operations {
- struct posix_acl *(*getacl)(struct inode *, int);
- void (*setacl)(struct inode *, int, struct posix_acl *);
-};
+extern struct xattr_handler generic_acl_access_handler;
+extern struct xattr_handler generic_acl_default_handler;
-size_t generic_acl_list(struct inode *, struct generic_acl_operations *, int,
- char *, size_t);
-int generic_acl_get(struct inode *, struct generic_acl_operations *, int,
- void *, size_t);
-int generic_acl_set(struct inode *, struct generic_acl_operations *, int,
- const void *, size_t);
-int generic_acl_init(struct inode *, struct inode *,
- struct generic_acl_operations *);
-int generic_acl_chmod(struct inode *, struct generic_acl_operations *);
+int generic_acl_init(struct inode *, struct inode *);
+int generic_acl_chmod(struct inode *);
+int generic_check_acl(struct inode *inode, int mask);
-#endif
+#endif /* LINUX_GENERIC_ACL_H */
Index: linux-2.6/include/linux/shmem_fs.h
===================================================================
--- linux-2.6.orig/include/linux/shmem_fs.h 2009-09-26 11:54:26.155261695 -0300
+++ linux-2.6/include/linux/shmem_fs.h 2009-09-26 11:54:58.230256457 -0300
@@ -41,20 +41,4 @@ static inline struct shmem_inode_info *S
extern int init_tmpfs(void);
extern int shmem_fill_super(struct super_block *sb, void *data, int silent);
-#ifdef CONFIG_TMPFS_POSIX_ACL
-int shmem_check_acl(struct inode *, int);
-int shmem_acl_init(struct inode *, struct inode *);
-
-extern struct xattr_handler shmem_xattr_acl_access_handler;
-extern struct xattr_handler shmem_xattr_acl_default_handler;
-
-extern struct generic_acl_operations shmem_acl_ops;
-
-#else
-static inline int shmem_acl_init(struct inode *inode, struct inode *dir)
-{
- return 0;
-}
-#endif /* CONFIG_TMPFS_POSIX_ACL */
-
#endif
Index: linux-2.6/mm/shmem.c
===================================================================
--- linux-2.6.orig/mm/shmem.c 2009-09-26 11:53:37.843006812 -0300
+++ linux-2.6/mm/shmem.c 2009-09-26 11:54:15.177004046 -0300
@@ -42,6 +42,7 @@ static struct vfsmount *shm_mnt;
#include <linux/xattr.h>
#include <linux/exportfs.h>
+#include <linux/posix_acl.h>
#include <linux/generic_acl.h>
#include <linux/mman.h>
#include <linux/string.h>
@@ -810,7 +811,7 @@ static int shmem_notify_change(struct de
error = inode_setattr(inode, attr);
#ifdef CONFIG_TMPFS_POSIX_ACL
if (!error && (attr->ia_valid & ATTR_MODE))
- error = generic_acl_chmod(inode, &shmem_acl_ops);
+ error = generic_acl_chmod(inode);
#endif
if (page)
page_cache_release(page);
@@ -1817,11 +1818,13 @@ shmem_mknod(struct inode *dir, struct de
return error;
}
}
- error = shmem_acl_init(inode, dir);
+#ifdef CONFIG_TMPFS_POSIX_ACL
+ error = generic_acl_init(inode, dir);
if (error) {
iput(inode);
return error;
}
+#endif
if (dir->i_mode & S_ISGID) {
inode->i_gid = dir->i_gid;
if (S_ISDIR(mode))
@@ -2068,8 +2071,8 @@ static struct xattr_handler shmem_xattr_
};
static struct xattr_handler *shmem_xattr_handlers[] = {
- &shmem_xattr_acl_access_handler,
- &shmem_xattr_acl_default_handler,
+ &generic_acl_access_handler,
+ &generic_acl_default_handler,
&shmem_xattr_security_handler,
NULL
};
@@ -2448,7 +2451,7 @@ static const struct inode_operations shm
.getxattr = generic_getxattr,
.listxattr = generic_listxattr,
.removexattr = generic_removexattr,
- .check_acl = shmem_check_acl,
+ .check_acl = generic_check_acl,
#endif
};
@@ -2471,7 +2474,7 @@ static const struct inode_operations shm
.getxattr = generic_getxattr,
.listxattr = generic_listxattr,
.removexattr = generic_removexattr,
- .check_acl = shmem_check_acl,
+ .check_acl = generic_check_acl,
#endif
};
@@ -2482,7 +2485,7 @@ static const struct inode_operations shm
.getxattr = generic_getxattr,
.listxattr = generic_listxattr,
.removexattr = generic_removexattr,
- .check_acl = shmem_check_acl,
+ .check_acl = generic_check_acl,
#endif
};
Index: linux-2.6/mm/shmem_acl.c
===================================================================
--- linux-2.6.orig/mm/shmem_acl.c 2009-09-26 11:53:37.846007474 -0300
+++ /dev/null 1970-01-01 00:00:00.000000000 +0000
@@ -1,133 +0,0 @@
-/*
- * mm/shmem_acl.c
- *
- * (C) 2005 Andreas Gruenbacher <agruen@xxxxxxx>
- *
- * This file is released under the GPL.
- */
-
-#include <linux/fs.h>
-#include <linux/shmem_fs.h>
-#include <linux/xattr.h>
-#include <linux/generic_acl.h>
-
-/**
- * shmem_get_acl - generic_acl_operations->getacl() operation
- */
-static struct posix_acl *
-shmem_get_acl(struct inode *inode, int type)
-{
- struct posix_acl *acl = NULL;
-
- spin_lock(&inode->i_lock);
- switch(type) {
- case ACL_TYPE_ACCESS:
- acl = posix_acl_dup(inode->i_acl);
- break;
-
- case ACL_TYPE_DEFAULT:
- acl = posix_acl_dup(inode->i_default_acl);
- break;
- }
- spin_unlock(&inode->i_lock);
-
- return acl;
-}
-
-/**
- * shmem_set_acl - generic_acl_operations->setacl() operation
- */
-static void
-shmem_set_acl(struct inode *inode, int type, struct posix_acl *acl)
-{
- struct posix_acl *free = NULL;
-
- spin_lock(&inode->i_lock);
- switch(type) {
- case ACL_TYPE_ACCESS:
- free = inode->i_acl;
- inode->i_acl = posix_acl_dup(acl);
- break;
-
- case ACL_TYPE_DEFAULT:
- free = inode->i_default_acl;
- inode->i_default_acl = posix_acl_dup(acl);
- break;
- }
- spin_unlock(&inode->i_lock);
- posix_acl_release(free);
-}
-
-struct generic_acl_operations shmem_acl_ops = {
- .getacl = shmem_get_acl,
- .setacl = shmem_set_acl,
-};
-
-static size_t
-shmem_xattr_list_acl(struct dentry *dentry, char *list, size_t list_size,
- const char *name, size_t name_len, int type)
-{
- 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;
-}
Index: linux-2.6/mm/Makefile
===================================================================
--- linux-2.6.orig/mm/Makefile 2009-09-25 16:57:56.079003962 -0300
+++ linux-2.6/mm/Makefile 2009-09-26 11:54:15.178003475 -0300
@@ -22,7 +22,6 @@ obj-$(CONFIG_HUGETLBFS) += hugetlb.o
obj-$(CONFIG_NUMA) += mempolicy.o
obj-$(CONFIG_SPARSEMEM) += sparse.o
obj-$(CONFIG_SPARSEMEM_VMEMMAP) += sparse-vmemmap.o
-obj-$(CONFIG_TMPFS_POSIX_ACL) += shmem_acl.o
obj-$(CONFIG_SLOB) += slob.o
obj-$(CONFIG_MMU_NOTIFIER) += mmu_notifier.o
obj-$(CONFIG_KSM) += ksm.o
--
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