do_readlinkat

Name:do_readlinkat

Proto:static int do_readlinkat(int dfd, const char __user *pathname, char __user *buf, int bufsiz)

Type:int

Parameter:

Type	Parameter	Name
int	dfd
const char __user *	pathname
char __user *	buf
int	bufsiz

392

empty = 0

393

lookup_flags = accept empty path [user_... only]

395

If bufsiz <= 0 Then Return -EINVAL

398

retry :

399

error = user_path_at_empty(dfd, pathname, lookup_flags, & path, & empty)

400

If Not error Then

401

inode = d_backing_inode - Get upper or lower inode we should be using*@upper: The upper layer* This is the helper that should be used to get at the inode that will be used* if this dentry were to be opened as a file. The inode may be on the upper

403

error = If empty Then -ENOENT Else -EINVAL

407

If d_is_symlink(dentry) || readlink Then

408

error = security_inode_readlink(dentry)

409

If Not error Then

410

touch_atime( & path)

411

error = vfs_readlink(dentry, buf, bufsiz)

414

path_put( & path)

415

If ry_estale - determine whether the caller should retry an operation*@error: the error that would currently be returned*@flags: flags being used for next lookup attempt* Check to see if the error code was -ESTALE, and then determine whether Then

416

lookup_flags |= ll ->d_revalidate() to trust no cache

417

Go to retry

420

Return error

**Caller**
Name	Describe
SYSCALL_DEFINE4
SYSCALL_DEFINE3

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