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>
diff --git a/fs/jfs/file.c b/fs/jfs/file.c
index 4ce7735..7f1a585 100644
--- a/fs/jfs/file.c
+++ b/fs/jfs/file.c
@@ -140,10 +140,10 @@
}
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,
diff --git a/fs/jfs/jfs_xattr.h b/fs/jfs/jfs_xattr.h
index e69e14f..561f6af 100644
--- a/fs/jfs/jfs_xattr.h
+++ b/fs/jfs/jfs_xattr.h
@@ -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 @@
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[];
diff --git a/fs/jfs/namei.c b/fs/jfs/namei.c
index 8a40941..7040062 100644
--- a/fs/jfs/namei.c
+++ b/fs/jfs/namei.c
@@ -1537,10 +1537,10 @@
.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,
diff --git a/fs/jfs/symlink.c b/fs/jfs/symlink.c
index f8db4fd..c94c7e4 100644
--- a/fs/jfs/symlink.c
+++ b/fs/jfs/symlink.c
@@ -25,19 +25,19 @@
.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,
};
diff --git a/fs/jfs/xattr.c b/fs/jfs/xattr.c
index 9cdf7dc4..beb182b 100644
--- a/fs/jfs/xattr.c
+++ b/fs/jfs/xattr.c
@@ -663,30 +663,6 @@
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 @@
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 @@
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 @@
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 @@
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,
};
