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authorMatthew Wilcox (Oracle) <willy@infradead.org>2020-10-03 05:55:22 +0300
committerAl Viro <viro@zeniv.linux.org.uk>2020-10-15 21:20:41 +0300
commit4c207ef48269377236cd38979197c5e1631c8c16 (patch)
tree29668769460a5f355b8f609bcae2cbe92758224a /fs/read_write.c
parent5ae4998b5d6fc703a16c9fa935fb7d335843bf22 (diff)
downloadlinux-4c207ef48269377236cd38979197c5e1631c8c16.tar.xz
fs: Allow a NULL pos pointer to __kernel_write
Linus prefers that callers be allowed to pass in a NULL pointer for ppos like new_sync_write(). Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'fs/read_write.c')
-rw-r--r--fs/read_write.c5
1 files changed, 3 insertions, 2 deletions
diff --git a/fs/read_write.c b/fs/read_write.c
index 8c61f67453e3..516eb51af70e 100644
--- a/fs/read_write.c
+++ b/fs/read_write.c
@@ -544,11 +544,12 @@ ssize_t __kernel_write(struct file *file, const void *buf, size_t count, loff_t
return warn_unsupported(file, "write");
init_sync_kiocb(&kiocb, file);
- kiocb.ki_pos = *pos;
+ kiocb.ki_pos = pos ? *pos : 0;
iov_iter_kvec(&iter, WRITE, &iov, 1, iov.iov_len);
ret = file->f_op->write_iter(&kiocb, &iter);
if (ret > 0) {
- *pos = kiocb.ki_pos;
+ if (pos)
+ *pos = kiocb.ki_pos;
fsnotify_modify(file);
add_wchar(current, ret);
}