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authorPavel Shilovsky <pshilovsky@samba.org>2014-06-27 10:33:11 +0400
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2014-09-17 09:04:01 -0700
commit8f516091b6c747c2db53b33c0eb955c5b3975792 (patch)
treeaa9b3da32e26b64396ce6ce4b41be6d47e767248 /fs
parent9b1eceeba2e3aeefa4725f51ca617fe683ddfa65 (diff)
CIFS: Fix async reading on reconnects
commit 038bc961c31b070269ecd07349a7ee2e839d4fec upstream. If we get into read_into_pages() from cifs_readv_receive() and then loose a network, we issue cifs_reconnect that moves all mids to a private list and issue their callbacks. The callback of the async read request sets a mid to retry, frees it and wakes up a process that waits on the rdata completion. After the connection is established we return from read_into_pages() with a short read, use the mid that was freed before and try to read the remaining data from the a newly created socket. Both actions are not what we want to do. In reconnect cases (-EAGAIN) we should not mask off the error with a short read but should return the error code instead. Acked-by: Jeff Layton <jlayton@samba.org> Signed-off-by: Pavel Shilovsky <pshilovsky@samba.org> Signed-off-by: Steve French <smfrench@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'fs')
-rw-r--r--fs/cifs/file.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/fs/cifs/file.c b/fs/cifs/file.c
index 8b0c656f2ab2..97b03895ac8c 100644
--- a/fs/cifs/file.c
+++ b/fs/cifs/file.c
@@ -2809,7 +2809,7 @@ cifs_uncached_read_into_pages(struct TCP_Server_Info *server,
total_read += result;
}
- return total_read > 0 ? total_read : result;
+ return total_read > 0 && result != -EAGAIN ? total_read : result;
}
static ssize_t
@@ -3232,7 +3232,7 @@ cifs_readpages_read_into_pages(struct TCP_Server_Info *server,
total_read += result;
}
- return total_read > 0 ? total_read : result;
+ return total_read > 0 && result != -EAGAIN ? total_read : result;
}
static int cifs_readpages(struct file *file, struct address_space *mapping,