From 102a0743326a03cd1a1202ceda21e175b7d3575c Mon Sep 17 00:00:00 2001
From: hc <hc@nodka.com>
Date: Tue, 20 Feb 2024 01:20:52 +0000
Subject: [PATCH] add new system file
---
kernel/fs/btrfs/xattr.c | 106 ++++++++++++++++++++++++++++++++++++++---------------
1 files changed, 76 insertions(+), 30 deletions(-)
diff --git a/kernel/fs/btrfs/xattr.c b/kernel/fs/btrfs/xattr.c
index f141b45..71712bf 100644
--- a/kernel/fs/btrfs/xattr.c
+++ b/kernel/fs/btrfs/xattr.c
@@ -76,9 +76,8 @@
return ret;
}
-static int do_setxattr(struct btrfs_trans_handle *trans,
- struct inode *inode, const char *name,
- const void *value, size_t size, int flags)
+int btrfs_setxattr(struct btrfs_trans_handle *trans, struct inode *inode,
+ const char *name, const void *value, size_t size, int flags)
{
struct btrfs_dir_item *di = NULL;
struct btrfs_root *root = BTRFS_I(inode)->root;
@@ -86,6 +85,8 @@
struct btrfs_path *path;
size_t name_len = strlen(name);
int ret = 0;
+
+ ASSERT(trans);
if (name_len + size > BTRFS_MAX_XATTR_SIZE(root->fs_info))
return -ENOSPC;
@@ -174,7 +175,7 @@
char *ptr;
if (size > old_data_len) {
- if (btrfs_leaf_free_space(fs_info, leaf) <
+ if (btrfs_leaf_free_space(leaf) <
(size - old_data_len)) {
ret = -ENOSPC;
goto out;
@@ -184,17 +185,15 @@
if (old_data_len + name_len + sizeof(*di) == item_size) {
/* No other xattrs packed in the same leaf item. */
if (size > old_data_len)
- btrfs_extend_item(fs_info, path,
- size - old_data_len);
+ btrfs_extend_item(path, size - old_data_len);
else if (size < old_data_len)
- btrfs_truncate_item(fs_info, path,
- data_size, 1);
+ btrfs_truncate_item(path, data_size, 1);
} else {
/* There are other xattrs packed in the same item. */
ret = btrfs_delete_one_dir_name(trans, root, path, di);
if (ret)
goto out;
- btrfs_extend_item(fs_info, path, data_size);
+ btrfs_extend_item(path, data_size);
}
item = btrfs_item_nr(slot);
@@ -214,40 +213,61 @@
}
out:
btrfs_free_path(path);
+ if (!ret) {
+ set_bit(BTRFS_INODE_COPY_EVERYTHING,
+ &BTRFS_I(inode)->runtime_flags);
+ clear_bit(BTRFS_INODE_NO_XATTRS, &BTRFS_I(inode)->runtime_flags);
+ }
return ret;
}
/*
* @value: "" makes the attribute to empty, NULL removes it
*/
-int btrfs_setxattr(struct btrfs_trans_handle *trans,
- struct inode *inode, const char *name,
- const void *value, size_t size, int flags)
+int btrfs_setxattr_trans(struct inode *inode, const char *name,
+ const void *value, size_t size, int flags)
{
struct btrfs_root *root = BTRFS_I(inode)->root;
+ struct btrfs_trans_handle *trans;
+ const bool start_trans = (current->journal_info == NULL);
int ret;
- if (btrfs_root_readonly(root))
- return -EROFS;
+ if (start_trans) {
+ /*
+ * 1 unit for inserting/updating/deleting the xattr
+ * 1 unit for the inode item update
+ */
+ trans = btrfs_start_transaction(root, 2);
+ if (IS_ERR(trans))
+ return PTR_ERR(trans);
+ } else {
+ /*
+ * This can happen when smack is enabled and a directory is being
+ * created. It happens through d_instantiate_new(), which calls
+ * smack_d_instantiate(), which in turn calls __vfs_setxattr() to
+ * set the transmute xattr (XATTR_NAME_SMACKTRANSMUTE) on the
+ * inode. We have already reserved space for the xattr and inode
+ * update at btrfs_mkdir(), so just use the transaction handle.
+ * We don't join or start a transaction, as that will reset the
+ * block_rsv of the handle and trigger a warning for the start
+ * case.
+ */
+ ASSERT(strncmp(name, XATTR_SECURITY_PREFIX,
+ XATTR_SECURITY_PREFIX_LEN) == 0);
+ trans = current->journal_info;
+ }
- if (trans)
- return do_setxattr(trans, inode, name, value, size, flags);
-
- trans = btrfs_start_transaction(root, 2);
- if (IS_ERR(trans))
- return PTR_ERR(trans);
-
- ret = do_setxattr(trans, inode, name, value, size, flags);
+ ret = btrfs_setxattr(trans, inode, name, value, size, flags);
if (ret)
goto out;
inode_inc_iversion(inode);
inode->i_ctime = current_time(inode);
- set_bit(BTRFS_INODE_COPY_EVERYTHING, &BTRFS_I(inode)->runtime_flags);
ret = btrfs_update_inode(trans, root, inode);
BUG_ON(ret);
out:
- btrfs_end_transaction(trans);
+ if (start_trans)
+ btrfs_end_transaction(trans);
return ret;
}
@@ -358,7 +378,8 @@
static int btrfs_xattr_handler_get(const struct xattr_handler *handler,
struct dentry *unused, struct inode *inode,
- const char *name, void *buffer, size_t size)
+ const char *name, void *buffer, size_t size,
+ int flags)
{
name = xattr_full_name(handler, name);
return btrfs_getxattr(inode, name, buffer, size);
@@ -369,8 +390,11 @@
const char *name, const void *buffer,
size_t size, int flags)
{
+ if (btrfs_root_readonly(BTRFS_I(inode)->root))
+ return -EROFS;
+
name = xattr_full_name(handler, name);
- return btrfs_setxattr(NULL, inode, name, buffer, size, flags);
+ return btrfs_setxattr_trans(inode, name, buffer, size, flags);
}
static int btrfs_xattr_handler_set_prop(const struct xattr_handler *handler,
@@ -378,8 +402,30 @@
const char *name, const void *value,
size_t size, int flags)
{
+ int ret;
+ struct btrfs_trans_handle *trans;
+ struct btrfs_root *root = BTRFS_I(inode)->root;
+
name = xattr_full_name(handler, name);
- return btrfs_set_prop(inode, name, value, size, flags);
+ ret = btrfs_validate_prop(name, value, size);
+ if (ret)
+ return ret;
+
+ trans = btrfs_start_transaction(root, 2);
+ if (IS_ERR(trans))
+ return PTR_ERR(trans);
+
+ ret = btrfs_set_prop(trans, inode, name, value, size, flags);
+ if (!ret) {
+ inode_inc_iversion(inode);
+ inode->i_ctime = current_time(inode);
+ ret = btrfs_update_inode(trans, root, inode);
+ BUG_ON(ret);
+ }
+
+ btrfs_end_transaction(trans);
+
+ return ret;
}
static const struct xattr_handler btrfs_security_xattr_handler = {
@@ -419,10 +465,10 @@
};
static int btrfs_initxattrs(struct inode *inode,
- const struct xattr *xattr_array, void *fs_info)
+ const struct xattr *xattr_array, void *fs_private)
{
+ struct btrfs_trans_handle *trans = fs_private;
const struct xattr *xattr;
- struct btrfs_trans_handle *trans = fs_info;
unsigned int nofs_flag;
char *name;
int err = 0;
@@ -442,7 +488,7 @@
strcpy(name, XATTR_SECURITY_PREFIX);
strcpy(name + XATTR_SECURITY_PREFIX_LEN, xattr->name);
err = btrfs_setxattr(trans, inode, name, xattr->value,
- xattr->value_len, 0);
+ xattr->value_len, 0);
kfree(name);
if (err < 0)
break;
--
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