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kernel: sulog: Simplify code using vfs_truncate

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ShirkNeko
2025-10-23 22:15:44 +08:00
parent 0cf65d71b6
commit 163424673f
4 changed files with 4 additions and 75 deletions
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37
kernel/sulog.c
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@@ -135,40 +135,11 @@ static void sulog_work_handler(struct work_struct *work)
}
if (fp->f_inode->i_size > SULOG_MAX_SIZE) {
pr_info("sulog: rotating log file, size: %lld\n", fp->f_inode->i_size);
filp_close(fp, 0);
struct path old_path;
if (!kern_path(SULOG_OLD_PATH, 0, &old_path)) {
ksu_vfs_unlink(old_path.dentry->d_parent->d_inode, old_path.dentry);
path_put(&old_path);
pr_info("sulog: log file exceeds maximum size, clearing...\n");
if (vfs_truncate(&fp->f_path, 0)) {
pr_err("sulog: failed to truncate log file\n");
}
struct path current_path, parent_path;
if (!kern_path(SULOG_PATH, 0, &current_path)) {
parent_path = current_path;
path_get(&parent_path);
parent_path.dentry = current_path.dentry->d_parent;
struct dentry *old_dentry = lookup_one_len("sulog.log.old",
parent_path.dentry, strlen("sulog.log.old"));
if (!IS_ERR(old_dentry)) {
ksu_vfs_rename(parent_path.dentry->d_inode, current_path.dentry,
parent_path.dentry->d_inode, old_dentry);
dput(old_dentry);
}
path_put(&current_path);
path_put(&parent_path);
}
fp = ksu_filp_open_compat(SULOG_PATH, O_WRONLY | O_CREAT | O_EXCL, 0640);
if (IS_ERR(fp)) {
pr_err("sulog: failed to create new log file: %ld\n", PTR_ERR(fp));
goto cleanup;
}
const char *rotate_msg = "=== Log file rotated, old log saved as sulog.log.old ===\n";
ksu_kernel_write_compat(fp, rotate_msg, strlen(rotate_msg), &pos);
pos = 0;
} else {
pos = fp->f_inode->i_size;
}