From 2fba46a04c383f91e7fe837d43bf1ab33ce32b6a Mon Sep 17 00:00:00 2001 From: Bob Peterson Date: Thu, 27 Feb 2020 12:47:53 -0600 Subject: gfs2: Change inode qa_data to allow multiple users Before this patch, multiple users called gfs2_qa_alloc which allocated a qadata structure to the inode, if quotas are turned on. Later, in file close or evict, the structure was deleted with gfs2_qa_delete. But there can be several competing processes who need access to the structure. There were races between file close (release) and the others. Thus, a release could delete the structure out from under a process that relied upon its existence. For example, chown. This patch changes the management of the qadata structures to be a get/put scheme. Function gfs2_qa_alloc has been changed to gfs2_qa_get and if the structure is allocated, the count essentially starts out at 1. Function gfs2_qa_delete has been renamed to gfs2_qa_put, and the last guy to decrement the count to 0 frees the memory. Signed-off-by: Bob Peterson --- fs/gfs2/bmap.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'fs/gfs2/bmap.c') diff --git a/fs/gfs2/bmap.c b/fs/gfs2/bmap.c index 4b9dbab50faf..d510a453dfa8 100644 --- a/fs/gfs2/bmap.c +++ b/fs/gfs2/bmap.c @@ -2183,7 +2183,7 @@ int gfs2_setattr_size(struct inode *inode, u64 newsize) inode_dio_wait(inode); - ret = gfs2_qa_alloc(ip); + ret = gfs2_qa_get(ip); if (ret) goto out; -- cgit