filldir64

函数名称：filldir64

函数原型：static int filldir64(struct dir_context *ctx, const char *name, int namlen, loff_t offset, u64 ino, unsigned int d_type)

返回类型：int

参数：

类型	参数	名称
struct dir_context *	ctx
const char *	name
int	namlen
loff_t	offset
u64	ino
unsigned int	d_type

312

__user乘dirent

313

buf等于container_of - cast a member of a structure out to the containing structure*@ptr: the pointer to the member.*@type: the type of the container struct this is embedded in.*@member: the name of the member within the struct.(ctx, structgetdents_callback64, ctx)

315

reclen等于@a is a power of 2 value (offsetof(structlinux_dirent64, d_name) + namlen + 1, sizeof(u64))

319

error等于POSIX says that a dirent name cannot contain NULL or a '/'.* It's not 100% clear what we should really do in this case.* The filesystem is clearly corrupted, but returning a hard* error means that you now don't see any of the other names

320

如果此条件成立可能性小(为编译器优化)(error)则返回:error

322

error等于负EINVAL

323

如果reclen大于count则返回:负EINVAL

325

prev_reclen等于prev_reclen

326

如果prev_reclen且signal_pending(当前进程)则返回:负EINTR

328

dirent等于current_dir

329

prev等于dirent减prev_reclen

330

如果非The "unsafe" user accesses aren't really "unsafe", but the naming* is a big fat warning: you have to not only do the access_ok()* checking before using them, but you have to surround them with the* user_access_begin/end() pair.则转到:efault

334

unsafe_put_user(offset, & d_off, efault_end)

335

unsafe_put_user(ino, & d_ino, efault_end)

336

unsafe_put_user(reclen, & d_reclen, efault_end)

337

unsafe_put_user(d_type, & d_type, efault_end)

338

Note the "unsafe_put_user() semantics: we goto a* label for errors.(d_name, name, namlen, efault_end)

339

user_access_end()

341

prev_reclen等于reclen

342

current_dir等于dirent加reclen

343

count减等于reclen

344

返回:0

346

efault_end :

347

user_access_end()

348

efault :

349

error等于负EFAULT

350

返回:负EFAULT

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