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jfs: use generic posix ACL infrastructure

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Copy the scheme I introduced to btrfs many years ago to only use the
xattr handler for ACLs, but pass plain attrs straight through.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Dave Kleikamp <dave.kleikamp@oracle.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Christoph Hellwig 2013-12-20 05:16:51 -08:00 committed by Al Viro
parent 2401dc2975
commit 2cc6a5a01c
7 changed files with 89 additions and 140 deletions
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105
fs/jfs/acl.c
View File

@ -72,7 +72,7 @@ struct posix_acl *jfs_get_acl(struct inode *inode, int type)
return acl;
}
static int jfs_set_acl(tid_t tid, struct inode *inode, int type,
static int __jfs_set_acl(tid_t tid, struct inode *inode, int type,
struct posix_acl *acl)
{
char *ea_name;
@ -80,21 +80,22 @@ static int jfs_set_acl(tid_t tid, struct inode *inode, int type,
int size = 0;
char *value = NULL;
if (S_ISLNK(inode->i_mode))
return -EOPNOTSUPP;
switch(type) {
case ACL_TYPE_ACCESS:
ea_name = POSIX_ACL_XATTR_ACCESS;
break;
case ACL_TYPE_DEFAULT:
ea_name = POSIX_ACL_XATTR_DEFAULT;
if (!S_ISDIR(inode->i_mode))
return acl ? -EACCES : 0;
break;
default:
return -EINVAL;
switch (type) {
case ACL_TYPE_ACCESS:
ea_name = POSIX_ACL_XATTR_ACCESS;
rc = posix_acl_equiv_mode(acl, &inode->i_mode);
if (rc < 0)
return rc;
if (rc == 0)
acl = NULL;
break;
case ACL_TYPE_DEFAULT:
ea_name = POSIX_ACL_XATTR_DEFAULT;
break;
default:
return -EINVAL;
}
if (acl) {
size = posix_acl_xattr_size(acl->a_count);
value = kmalloc(size, GFP_KERNEL);
@ -114,65 +115,43 @@ static int jfs_set_acl(tid_t tid, struct inode *inode, int type,
return rc;
}
int jfs_set_acl(struct inode *inode, struct posix_acl *acl, int type)
{
int rc;
tid_t tid;
tid = txBegin(inode->i_sb, 0);
mutex_lock(&JFS_IP(inode)->commit_mutex);
rc = __jfs_set_acl(tid, inode, type, acl);
if (!rc)
rc = txCommit(tid, 1, &inode, 0);
txEnd(tid);
mutex_unlock(&JFS_IP(inode)->commit_mutex);
return rc;
}
int jfs_init_acl(tid_t tid, struct inode *inode, struct inode *dir)
{
struct posix_acl *acl = NULL;
struct posix_acl *default_acl, *acl;
int rc = 0;
if (S_ISLNK(inode->i_mode))
return 0;
rc = posix_acl_create(dir, &inode->i_mode, &default_acl, &acl);
if (rc)
return rc;
acl = jfs_get_acl(dir, ACL_TYPE_DEFAULT);
if (IS_ERR(acl))
return PTR_ERR(acl);
if (default_acl) {
rc = __jfs_set_acl(tid, inode, ACL_TYPE_DEFAULT, default_acl);
posix_acl_release(default_acl);
}
if (acl) {
if (S_ISDIR(inode->i_mode)) {
rc = jfs_set_acl(tid, inode, ACL_TYPE_DEFAULT, acl);
if (rc)
goto cleanup;
}
rc = __posix_acl_create(&acl, GFP_KERNEL, &inode->i_mode);
if (rc < 0)
goto cleanup; /* posix_acl_release(NULL) is no-op */
if (rc > 0)
rc = jfs_set_acl(tid, inode, ACL_TYPE_ACCESS, acl);
cleanup:
if (!rc)
rc = __jfs_set_acl(tid, inode, ACL_TYPE_ACCESS, acl);
posix_acl_release(acl);
} else
inode->i_mode &= ~current_umask();
}
JFS_IP(inode)->mode2 = (JFS_IP(inode)->mode2 & 0xffff0000) |
inode->i_mode;
return rc;
}
int jfs_acl_chmod(struct inode *inode)
{
struct posix_acl *acl;
int rc;
tid_t tid;
if (S_ISLNK(inode->i_mode))
return -EOPNOTSUPP;
acl = jfs_get_acl(inode, ACL_TYPE_ACCESS);
if (IS_ERR(acl) || !acl)
return PTR_ERR(acl);
rc = __posix_acl_chmod(&acl, GFP_KERNEL, inode->i_mode);
if (rc)
return rc;
tid = txBegin(inode->i_sb, 0);
mutex_lock(&JFS_IP(inode)->commit_mutex);
rc = jfs_set_acl(tid, inode, ACL_TYPE_ACCESS, acl);
if (!rc)
rc = txCommit(tid, 1, &inode, 0);
txEnd(tid);
mutex_unlock(&JFS_IP(inode)->commit_mutex);
posix_acl_release(acl);
return rc;
}

4
fs/jfs/file.c
View File

@ -19,6 +19,7 @@
#include <linux/mm.h>
#include <linux/fs.h>
#include <linux/posix_acl.h>
#include <linux/quotaops.h>
#include "jfs_incore.h"
#include "jfs_inode.h"
@ -131,7 +132,7 @@ int jfs_setattr(struct dentry *dentry, struct iattr *iattr)
mark_inode_dirty(inode);
if (iattr->ia_valid & ATTR_MODE)
rc = jfs_acl_chmod(inode);
rc = posix_acl_chmod(inode, inode->i_mode);
return rc;
}
@ -143,6 +144,7 @@ const struct inode_operations jfs_file_inode_operations = {
.setattr = jfs_setattr,
#ifdef CONFIG_JFS_POSIX_ACL
.get_acl = jfs_get_acl,
.set_acl = jfs_set_acl,
#endif
};

7
fs/jfs/jfs_acl.h
View File

@ -21,8 +21,8 @@
#ifdef CONFIG_JFS_POSIX_ACL
struct posix_acl *jfs_get_acl(struct inode *inode, int type);
int jfs_set_acl(struct inode *inode, struct posix_acl *acl, int type);
int jfs_init_acl(tid_t, struct inode *, struct inode *);
int jfs_acl_chmod(struct inode *inode);
#else
@ -32,10 +32,5 @@ static inline int jfs_init_acl(tid_t tid, struct inode *inode,
return 0;
}
static inline int jfs_acl_chmod(struct inode *inode)
{
return 0;
}
#endif
#endif /* _H_JFS_ACL */

2
fs/jfs/jfs_xattr.h
View File

@ -61,6 +61,8 @@ extern ssize_t jfs_getxattr(struct dentry *, const char *, void *, size_t);
extern ssize_t jfs_listxattr(struct dentry *, char *, size_t);
extern int jfs_removexattr(struct dentry *, const char *);
extern const struct xattr_handler *jfs_xattr_handlers[];
#ifdef CONFIG_JFS_SECURITY
extern int jfs_init_security(tid_t, struct inode *, struct inode *,
const struct qstr *);

1
fs/jfs/namei.c
View File

@ -1524,6 +1524,7 @@ const struct inode_operations jfs_dir_inode_operations = {
.setattr = jfs_setattr,
#ifdef CONFIG_JFS_POSIX_ACL
.get_acl = jfs_get_acl,
.set_acl = jfs_set_acl,
#endif
};

2
fs/jfs/super.c
View File

@ -44,6 +44,7 @@
#include "jfs_imap.h"
#include "jfs_acl.h"
#include "jfs_debug.h"
#include "jfs_xattr.h"
MODULE_DESCRIPTION("The Journaled Filesystem (JFS)");
MODULE_AUTHOR("Steve Best/Dave Kleikamp/Barry Arndt, IBM");
@ -522,6 +523,7 @@ static int jfs_fill_super(struct super_block *sb, void *data, int silent)
*/
sb->s_op = &jfs_super_operations;
sb->s_export_op = &jfs_export_operations;
sb->s_xattr = jfs_xattr_handlers;
#ifdef CONFIG_QUOTA
sb->dq_op = &dquot_operations;
sb->s_qcop = &dquot_quotactl_ops;

108
fs/jfs/xattr.c
View File

@ -665,82 +665,13 @@ static int ea_put(tid_t tid, struct inode *inode, struct ea_buffer *ea_buf,
return 0;
}
/*
* can_set_system_xattr
*
* This code is specific to the system.* namespace. It contains policy
* which doesn't belong in the main xattr codepath.
*/
static int can_set_system_xattr(struct inode *inode, const char *name,
const void *value, size_t value_len)
{
#ifdef CONFIG_JFS_POSIX_ACL
struct posix_acl *acl;
int rc;
if (!inode_owner_or_capable(inode))
return -EPERM;
/*
* POSIX_ACL_XATTR_ACCESS is tied to i_mode
*/
if (strcmp(name, POSIX_ACL_XATTR_ACCESS) == 0) {
acl = posix_acl_from_xattr(&init_user_ns, value, value_len);
if (IS_ERR(acl)) {
rc = PTR_ERR(acl);
printk(KERN_ERR "posix_acl_from_xattr returned %d\n",
rc);
return rc;
}
if (acl) {
rc = posix_acl_equiv_mode(acl, &inode->i_mode);
posix_acl_release(acl);
if (rc < 0) {
printk(KERN_ERR
"posix_acl_equiv_mode returned %d\n",
rc);
return rc;
}
mark_inode_dirty(inode);
}
/*
* We're changing the ACL. Get rid of the cached one
*/
forget_cached_acl(inode, ACL_TYPE_ACCESS);
return 0;
} else if (strcmp(name, POSIX_ACL_XATTR_DEFAULT) == 0) {
acl = posix_acl_from_xattr(&init_user_ns, value, value_len);
if (IS_ERR(acl)) {
rc = PTR_ERR(acl);
printk(KERN_ERR "posix_acl_from_xattr returned %d\n",
rc);
return rc;
}
posix_acl_release(acl);
/*
* We're changing the default ACL. Get rid of the cached one
*/
forget_cached_acl(inode, ACL_TYPE_DEFAULT);
return 0;
}
#endif /* CONFIG_JFS_POSIX_ACL */
return -EOPNOTSUPP;
}
/*
* Most of the permission checking is done by xattr_permission in the vfs.
* The local file system is responsible for handling the system.* namespace.
* We also need to verify that this is a namespace that we recognize.
*/
static int can_set_xattr(struct inode *inode, const char *name,
const void *value, size_t value_len)
{
if (!strncmp(name, XATTR_SYSTEM_PREFIX, XATTR_SYSTEM_PREFIX_LEN))
return can_set_system_xattr(inode, name, value, value_len);
if (!strncmp(name, XATTR_OS2_PREFIX, XATTR_OS2_PREFIX_LEN)) {
/*
* This makes sure that we aren't trying to set an
@ -748,7 +679,7 @@ static int can_set_xattr(struct inode *inode, const char *name,
* with "os2."
*/
if (is_known_namespace(name + XATTR_OS2_PREFIX_LEN))
return -EOPNOTSUPP;
return -EOPNOTSUPP;
return 0;
}
@ -913,6 +844,14 @@ int jfs_setxattr(struct dentry *dentry, const char *name, const void *value,
if ((rc = can_set_xattr(inode, name, value, value_len)))
return rc;
/*
* If this is a request for a synthetic attribute in the system.*
* namespace use the generic infrastructure to resolve a handler
* for it via sb->s_xattr.
*/
if (!strncmp(name, XATTR_SYSTEM_PREFIX, XATTR_SYSTEM_PREFIX_LEN))
return generic_setxattr(dentry, name, value, value_len, flags);
if (value == NULL) { /* empty EA, do not remove */
value = "";
value_len = 0;
@ -986,6 +925,14 @@ ssize_t jfs_getxattr(struct dentry *dentry, const char *name, void *data,
{
int err;
/*
* If this is a request for a synthetic attribute in the system.*
* namespace use the generic infrastructure to resolve a handler
* for it via sb->s_xattr.
*/
if (!strncmp(name, XATTR_SYSTEM_PREFIX, XATTR_SYSTEM_PREFIX_LEN))
return generic_getxattr(dentry, name, data, buf_size);
if (strncmp(name, XATTR_OS2_PREFIX, XATTR_OS2_PREFIX_LEN) == 0) {
/*
* skip past "os2." prefix
@ -1077,6 +1024,14 @@ int jfs_removexattr(struct dentry *dentry, const char *name)
if ((rc = can_set_xattr(inode, name, NULL, 0)))
return rc;
/*
* If this is a request for a synthetic attribute in the system.*
* namespace use the generic infrastructure to resolve a handler
* for it via sb->s_xattr.
*/
if (!strncmp(name, XATTR_SYSTEM_PREFIX, XATTR_SYSTEM_PREFIX_LEN))
return generic_removexattr(dentry, name);
tid = txBegin(inode->i_sb, 0);
mutex_lock(&ji->commit_mutex);
rc = __jfs_setxattr(tid, dentry->d_inode, name, NULL, 0, XATTR_REPLACE);
@ -1088,6 +1043,19 @@ int jfs_removexattr(struct dentry *dentry, const char *name)
return rc;
}
/*
* List of handlers for synthetic system.* attributes. All real ondisk
* attributes are handled directly.
*/
const struct xattr_handler *jfs_xattr_handlers[] = {
#ifdef JFS_POSIX_ACL
&posix_acl_access_xattr_handler,
&posix_acl_default_xattr_handler,
#endif
NULL,
};
#ifdef CONFIG_JFS_SECURITY
static int jfs_initxattrs(struct inode *inode, const struct xattr *xattr_array,
void *fs_info)