raspi/linux
1
0
Fork 1
mirror of https://github.com/raspberrypi/linux.git synced 2025-12-06 01:49:46 +00:00
Code Issues Projects Releases Wiki Activity

CIFS: Fix splice read for non-cached files

Browse Source 
commit 9c25702cee upstream.

Currently we call copy_page_to_iter() for uncached reading into a pipe.
This is wrong because it treats pages as VFS cache pages and copies references
rather than actual data. When we are trying to read from the pipe we end up
calling page_cache_pipe_buf_confirm() which returns -ENODATA. This error
is translated into 0 which is returned to a user.

This issue is reproduced by running xfs-tests suite (generic test #249)
against mount points with "cache=none". Fix it by mapping pages manually
and calling copy_to_iter() that copies data into the pipe.

Signed-off-by: Pavel Shilovsky <pshilov@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Pavel Shilovsky
2017-01-19 13:53:15 -08:00
committed by popcornmix
parent 79bebadd4e
commit 2a1b95dd97
1 changed files with 9 additions and 1 deletions
Download Patch File Download Diff File Expand all files Collapse all files

10
fs/cifs/file.c
View File

@@ -2884,7 +2884,15 @@ cifs_readdata_to_iov(struct cifs_readdata *rdata, struct iov_iter *iter)
for (i = 0; i < rdata->nr_pages; i++) {
struct page *page = rdata->pages[i];
size_t copy = min_t(size_t, remaining, PAGE_SIZE);
size_t written = copy_page_to_iter(page, 0, copy, iter);
size_t written;
if (unlikely(iter->type & ITER_PIPE)) {
void *addr = kmap_atomic(page);
written = copy_to_iter(addr, copy, iter);
kunmap_atomic(addr);
} else
written = copy_page_to_iter(page, 0, copy, iter);
remaining -= written;
if (written < copy && iov_iter_count(iter) > 0)
break;