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convert vmsplice() to CLASS(fd)

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Irregularity here is fdput() not in the same scope as fdget(); we could
just lift it out vmsplice_type() in vmsplice(2), but there's no much
point keeping vmsplice_type() separate after that...

Reviewed-by: Christian Brauner <brauner@kernel.org>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2024-06-06 15:50:15 -04:00
parent 0d113fcbc2
commit a6f46579d7
1 changed files with 10 additions and 23 deletions
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33
fs/splice.c
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@ -1564,21 +1564,6 @@ static ssize_t vmsplice_to_pipe(struct file *file, struct iov_iter *iter,
return ret;
}
static int vmsplice_type(struct fd f, int *type)
{
if (!fd_file(f))
return -EBADF;
if (fd_file(f)->f_mode & FMODE_WRITE) {
*type = ITER_SOURCE;
} else if (fd_file(f)->f_mode & FMODE_READ) {
*type = ITER_DEST;
} else {
fdput(f);
return -EBADF;
}
return 0;
}
/*
* Note that vmsplice only really supports true splicing _from_ user memory
* to a pipe, not the other way around. Splicing from user memory is a simple
@ -1602,21 +1587,25 @@ SYSCALL_DEFINE4(vmsplice, int, fd, const struct iovec __user *, uiov,
struct iovec *iov = iovstack;
struct iov_iter iter;
ssize_t error;
struct fd f;
int type;
if (unlikely(flags & ~SPLICE_F_ALL))
return -EINVAL;
f = fdget(fd);
error = vmsplice_type(f, &type);
if (error)
return error;
CLASS(fd, f)(fd);
if (fd_empty(f))
return -EBADF;
if (fd_file(f)->f_mode & FMODE_WRITE)
type = ITER_SOURCE;
else if (fd_file(f)->f_mode & FMODE_READ)
type = ITER_DEST;
else
return -EBADF;
error = import_iovec(type, uiov, nr_segs,
ARRAY_SIZE(iovstack), &iov, &iter);
if (error < 0)
goto out_fdput;
return error;
if (!iov_iter_count(&iter))
error = 0;
@ -1626,8 +1615,6 @@ SYSCALL_DEFINE4(vmsplice, int, fd, const struct iovec __user *, uiov,
error = vmsplice_to_user(fd_file(f), &iter, flags);
kfree(iov);
out_fdput:
fdput(f);
return error;
}