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splice: fix infinite loop in generic_file_splice_read()

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There's a quirky loop in generic_file_splice_read() that could go
on indefinitely, if the file splice returns 0 permanently (and not
just as a temporary condition). Get rid of the loop and pass
back -EAGAIN correctly from __generic_file_splice_read(), so we
handle that condition properly as well.

Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
This commit is contained in:
Jens Axboe 2008-04-10 08:24:25 +02:00
parent f4be31ec96
commit 8191ecd1d1
1 changed files with 6 additions and 25 deletions
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31
fs/splice.c
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@ -370,8 +370,10 @@ __generic_file_splice_read(struct file *in, loff_t *ppos,
* for an in-flight io page
*/
if (flags & SPLICE_F_NONBLOCK) {
if (TestSetPageLocked(page))
if (TestSetPageLocked(page)) {
error = -EAGAIN;
break;
}
} else
lock_page(page);
@ -479,9 +481,8 @@ ssize_t generic_file_splice_read(struct file *in, loff_t *ppos,
struct pipe_inode_info *pipe, size_t len,
unsigned int flags)
{
ssize_t spliced;
int ret;
loff_t isize, left;
int ret;
isize = i_size_read(in->f_mapping->host);
if (unlikely(*ppos >= isize))
@ -491,29 +492,9 @@ ssize_t generic_file_splice_read(struct file *in, loff_t *ppos,
if (unlikely(left < len))
len = left;
ret = 0;
spliced = 0;
while (len && !spliced) {
ret = __generic_file_splice_read(in, ppos, pipe, len, flags);
if (ret < 0)
break;
else if (!ret) {
if (spliced)
break;
if (flags & SPLICE_F_NONBLOCK) {
ret = -EAGAIN;
break;
}
}
ret = __generic_file_splice_read(in, ppos, pipe, len, flags);
if (ret > 0)
*ppos += ret;
len -= ret;
spliced += ret;
}
if (spliced)
return spliced;
return ret;
}