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new_sync_write(): discard ->ki_pos unless the return value is positive

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That allows ->write_iter() instances much more convenient life wrt
iocb->ki_pos (and fixes several filesystems with borderline POSIX
violations when zero-length write succeeds and changes the current
position).

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2015-04-06 20:50:38 -04:00
parent 22c6186ece
commit f765b134c0
1 changed files with 2 additions and 1 deletions
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3
fs/read_write.c
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@ -477,7 +477,8 @@ static ssize_t new_sync_write(struct file *filp, const char __user *buf, size_t
ret = filp->f_op->write_iter(&kiocb, &iter);
BUG_ON(ret == -EIOCBQUEUED);
*ppos = kiocb.ki_pos;
if (ret > 0)
*ppos = kiocb.ki_pos;
return ret;
}