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CIFS: use the correct length when pinning memory for direct I/O for write 

The current code attempts to pin memory using the largest possible wsize
based on the currect SMB credits. This doesn't cause kernel oops but this
is not optimal as we may pin more pages then actually needed.

Fix this by only pinning what are needed for doing this write I/O.

Signed-off-by: Long Li <longli@microsoft.com>
Cc: stable@vger.kernel.org
Signed-off-by: Steve French <stfrench@microsoft.com>
Reviewed-by: Joey Pabalinas <joeypabalinas@gmail.com>
This commit is contained in:
Long Li 2018-12-16 23:17:04 +00:00 committed by Steve French
parent 59a63e479c
commit b6bc8a7b99
1 changed files with 3 additions and 1 deletions
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4
fs/cifs/file.c
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@ -2617,11 +2617,13 @@ cifs_write_from_iter(loff_t offset, size_t len, struct iov_iter *from,
if (rc)
break;
cur_len = min_t(const size_t, len, wsize);
if (ctx->direct_io) {
ssize_t result;
result = iov_iter_get_pages_alloc(
from, &pagevec, wsize, &start);
from, &pagevec, cur_len, &start);
if (result < 0) {
cifs_dbg(VFS,
"direct_writev couldn't get user pages "