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jfs: Switch to generic xattr handlers 

This is mostly the same as on other filesystems except for attribute
names with an "os2." prefix: for those, the prefix is not stored on
disk, and on-attribute names without a prefix have "os2." added.

As on several other filesystems, the underlying function for
setting/removing xattrs (__jfs_setxattr) removes attributes when the
value is NULL, so the set xattr handlers will work as expected.

Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Andreas Gruenbacher 2016-04-22 14:43:49 +02:00 committed by Al Viro
parent 6c8f980c75
commit c8b6056a50
5 changed files with 84 additions and 116 deletions
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6
fs/jfs/file.c
View File

@ -140,10 +140,10 @@ int jfs_setattr(struct dentry *dentry, struct iattr *iattr)
}
const struct inode_operations jfs_file_inode_operations = {
.setxattr = jfs_setxattr,
.getxattr = jfs_getxattr,
.setxattr = generic_setxattr,
.getxattr = generic_getxattr,
.listxattr = jfs_listxattr,
.removexattr = jfs_removexattr,
.removexattr = generic_removexattr,
.setattr = jfs_setattr,
#ifdef CONFIG_JFS_POSIX_ACL
.get_acl = jfs_get_acl,

6
fs/jfs/jfs_xattr.h
View File

@ -19,6 +19,8 @@
#ifndef H_JFS_XATTR
#define H_JFS_XATTR
#include <linux/xattr.h>
/*
* jfs_ea_list describe the on-disk format of the extended attributes.
* I know the null-terminator is redundant since namelen is stored, but
@ -54,12 +56,8 @@ struct jfs_ea_list {
extern int __jfs_setxattr(tid_t, struct inode *, const char *, const void *,
size_t, int);
extern int jfs_setxattr(struct dentry *, const char *, const void *, size_t,
int);
extern ssize_t __jfs_getxattr(struct inode *, const char *, void *, size_t);
extern ssize_t jfs_getxattr(struct dentry *, struct inode *, 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[];

6
fs/jfs/namei.c
View File

@ -1537,10 +1537,10 @@ const struct inode_operations jfs_dir_inode_operations = {
.rmdir = jfs_rmdir,
.mknod = jfs_mknod,
.rename = jfs_rename,
.setxattr = jfs_setxattr,
.getxattr = jfs_getxattr,
.setxattr = generic_setxattr,
.getxattr = generic_getxattr,
.listxattr = jfs_listxattr,
.removexattr = jfs_removexattr,
.removexattr = generic_removexattr,
.setattr = jfs_setattr,
#ifdef CONFIG_JFS_POSIX_ACL
.get_acl = jfs_get_acl,

12
fs/jfs/symlink.c
View File

@ -25,19 +25,19 @@ const struct inode_operations jfs_fast_symlink_inode_operations = {
.readlink = generic_readlink,
.get_link = simple_get_link,
.setattr = jfs_setattr,
.setxattr = jfs_setxattr,
.getxattr = jfs_getxattr,
.setxattr = generic_setxattr,
.getxattr = generic_getxattr,
.listxattr = jfs_listxattr,
.removexattr = jfs_removexattr,
.removexattr = generic_removexattr,
};
const struct inode_operations jfs_symlink_inode_operations = {
.readlink = generic_readlink,
.get_link = page_get_link,
.setattr = jfs_setattr,
.setxattr = jfs_setxattr,
.getxattr = jfs_getxattr,
.setxattr = generic_setxattr,
.getxattr = generic_getxattr,
.listxattr = jfs_listxattr,
.removexattr = jfs_removexattr,
.removexattr = generic_removexattr,
};

170
fs/jfs/xattr.c
View File

@ -663,30 +663,6 @@ static int ea_put(tid_t tid, struct inode *inode, struct ea_buffer *ea_buf,
return 0;
}
/*
* Most of the permission checking is done by xattr_permission in the vfs.
* We also need to verify that this is a namespace that we recognize.
*/
static bool map_name_to_disk(const char **name)
{
if (!strncmp(*name, XATTR_OS2_PREFIX, XATTR_OS2_PREFIX_LEN)) {
/*
* This makes sure that we aren't trying to set an
* attribute in a different namespace by prefixing it
* with "os2."
*/
if (is_known_namespace(*name + XATTR_OS2_PREFIX_LEN))
return false;
*name += XATTR_OS2_PREFIX_LEN;
return true;
}
/*
* Don't allow setting an attribute in an unknown namespace.
*/
return is_known_namespace(*name);
}
int __jfs_setxattr(tid_t tid, struct inode *inode, const char *name,
const void *value, size_t value_len, int flags)
{
@ -826,42 +802,6 @@ int __jfs_setxattr(tid_t tid, struct inode *inode, const char *name,
return rc;
}
int jfs_setxattr(struct dentry *dentry, const char *name, const void *value,
size_t value_len, int flags)
{
struct inode *inode = d_inode(dentry);
struct jfs_inode_info *ji = JFS_IP(inode);
int rc;
tid_t tid;
/*
* 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 (!map_name_to_disk(&name))
return -EOPNOTSUPP;
if (value == NULL) { /* empty EA, do not remove */
value = "";
value_len = 0;
}
tid = txBegin(inode->i_sb, 0);
mutex_lock(&ji->commit_mutex);
rc = __jfs_setxattr(tid, d_inode(dentry), name, value, value_len,
flags);
if (!rc)
rc = txCommit(tid, 1, &inode, 0);
txEnd(tid);
mutex_unlock(&ji->commit_mutex);
return rc;
}
ssize_t __jfs_getxattr(struct inode *inode, const char *name, void *data,
size_t buf_size)
{
@ -913,27 +853,6 @@ ssize_t __jfs_getxattr(struct inode *inode, const char *name, void *data,
return size;
}
ssize_t jfs_getxattr(struct dentry *dentry, struct inode *inode,
const char *name, void *data, size_t buf_size)
{
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, inode, name, data, buf_size);
if (!map_name_to_disk(&name))
return -EOPNOTSUPP;
err = __jfs_getxattr(inode, name, data, buf_size);
return err;
}
/*
* No special permissions are needed to list attributes except for trusted.*
*/
@ -997,27 +916,16 @@ ssize_t jfs_listxattr(struct dentry * dentry, char *data, size_t buf_size)
return size;
}
int jfs_removexattr(struct dentry *dentry, const char *name)
static int __jfs_xattr_set(struct inode *inode, const char *name,
const void *value, size_t size, int flags)
{
struct inode *inode = d_inode(dentry);
struct jfs_inode_info *ji = JFS_IP(inode);
int rc;
tid_t tid;
/*
* 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);
if (!map_name_to_disk(&name))
return -EOPNOTSUPP;
int rc;
tid = txBegin(inode->i_sb, 0);
mutex_lock(&ji->commit_mutex);
rc = __jfs_setxattr(tid, d_inode(dentry), name, NULL, 0, XATTR_REPLACE);
rc = __jfs_setxattr(tid, inode, name, value, size, flags);
if (!rc)
rc = txCommit(tid, 1, &inode, 0);
txEnd(tid);
@ -1026,15 +934,77 @@ 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.
*/
static int jfs_xattr_get(const struct xattr_handler *handler,
struct dentry *unused, struct inode *inode,
const char *name, void *value, size_t size)
{
name = xattr_full_name(handler, name);
return __jfs_getxattr(inode, name, value, size);
}
static int jfs_xattr_set(const struct xattr_handler *handler,
struct dentry *dentry, const char *name,
const void *value, size_t size, int flags)
{
struct inode *inode = d_inode(dentry);
name = xattr_full_name(handler, name);
return __jfs_xattr_set(inode, name, value, size, flags);
}
static int jfs_xattr_get_os2(const struct xattr_handler *handler,
struct dentry *unused, struct inode *inode,
const char *name, void *value, size_t size)
{
if (is_known_namespace(name))
return -EOPNOTSUPP;
return __jfs_getxattr(inode, name, value, size);
}
static int jfs_xattr_set_os2(const struct xattr_handler *handler,
struct dentry *dentry, const char *name,
const void *value, size_t size, int flags)
{
struct inode *inode = d_inode(dentry);
if (is_known_namespace(name))
return -EOPNOTSUPP;
return __jfs_xattr_set(inode, name, value, size, flags);
}
static const struct xattr_handler jfs_user_xattr_handler = {
.prefix = XATTR_USER_PREFIX,
.get = jfs_xattr_get,
.set = jfs_xattr_set,
};
static const struct xattr_handler jfs_os2_xattr_handler = {
.prefix = XATTR_OS2_PREFIX,
.get = jfs_xattr_get_os2,
.set = jfs_xattr_set_os2,
};
static const struct xattr_handler jfs_security_xattr_handler = {
.prefix = XATTR_SECURITY_PREFIX,
.get = jfs_xattr_get,
.set = jfs_xattr_set,
};
static const struct xattr_handler jfs_trusted_xattr_handler = {
.prefix = XATTR_TRUSTED_PREFIX,
.get = jfs_xattr_get,
.set = jfs_xattr_set,
};
const struct xattr_handler *jfs_xattr_handlers[] = {
#ifdef CONFIG_JFS_POSIX_ACL
&posix_acl_access_xattr_handler,
&posix_acl_default_xattr_handler,
#endif
&jfs_os2_xattr_handler,
&jfs_user_xattr_handler,
&jfs_security_xattr_handler,
&jfs_trusted_xattr_handler,
NULL,
};