From 26c87fb7d10dadc59a475c7809adc05303bf951e Mon Sep 17 00:00:00 2001 From: Christoph Hellwig Date: Sat, 27 May 2017 11:16:47 +0300 Subject: [PATCH] fs: remove do_compat_readv_writev opencode it in both callers to simplify the call stack a bit. Signed-off-by: Christoph Hellwig Signed-off-by: Al Viro --- fs/read_write.c | 42 ++++++++++++++++-------------------------- 1 file changed, 16 insertions(+), 26 deletions(-) diff --git a/fs/read_write.c b/fs/read_write.c index 94cb71058098..5cbdf23d924f 100644 --- a/fs/read_write.c +++ b/fs/read_write.c @@ -1142,32 +1142,13 @@ SYSCALL_DEFINE6(pwritev2, unsigned long, fd, const struct iovec __user *, vec, } #ifdef CONFIG_COMPAT - -static ssize_t compat_do_readv_writev(int type, struct file *file, - const struct compat_iovec __user *uvector, - unsigned long nr_segs, loff_t *pos, - int flags) -{ - struct iovec iovstack[UIO_FASTIOV]; - struct iovec *iov = iovstack; - struct iov_iter iter; - ssize_t ret; - - ret = compat_import_iovec(type, uvector, nr_segs, - UIO_FASTIOV, &iov, &iter); - if (ret < 0) - return ret; - - ret = __do_readv_writev(type, file, &iter, pos, flags); - kfree(iov); - - return ret; -} - static size_t compat_readv(struct file *file, const struct compat_iovec __user *vec, unsigned long vlen, loff_t *pos, int flags) { + struct iovec iovstack[UIO_FASTIOV]; + struct iovec *iov = iovstack; + struct iov_iter iter; ssize_t ret = -EBADF; if (!(file->f_mode & FMODE_READ)) @@ -1177,8 +1158,11 @@ static size_t compat_readv(struct file *file, if (!(file->f_mode & FMODE_CAN_READ)) goto out; - ret = compat_do_readv_writev(READ, file, vec, vlen, pos, flags); - + ret = compat_import_iovec(READ, vec, vlen, UIO_FASTIOV, &iov, &iter); + if (ret < 0) + goto out; + ret = __do_readv_writev(READ, file, &iter, pos, flags); + kfree(iov); out: if (ret > 0) add_rchar(current, ret); @@ -1275,6 +1259,9 @@ static size_t compat_writev(struct file *file, const struct compat_iovec __user *vec, unsigned long vlen, loff_t *pos, int flags) { + struct iovec iovstack[UIO_FASTIOV]; + struct iovec *iov = iovstack; + struct iov_iter iter; ssize_t ret = -EBADF; if (!(file->f_mode & FMODE_WRITE)) @@ -1284,8 +1271,11 @@ static size_t compat_writev(struct file *file, if (!(file->f_mode & FMODE_CAN_WRITE)) goto out; - ret = compat_do_readv_writev(WRITE, file, vec, vlen, pos, flags); - + ret = compat_import_iovec(WRITE, vec, vlen, UIO_FASTIOV, &iov, &iter); + if (ret < 0) + goto out; + ret = __do_readv_writev(WRITE, file, &iter, pos, flags); + kfree(iov); out: if (ret > 0) add_wchar(current, ret);