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authorBob Peterson <rpeterso@redhat.com>2020-02-27 12:47:53 -0600
committerBob Peterson <rpeterso@redhat.com>2020-03-27 14:08:04 -0500
commit2fba46a04c383f91e7fe837d43bf1ab33ce32b6a (patch)
tree3137e791a08473e956a2a6ac477cb20b8677081b /fs/gfs2/super.c
parentd580712a37272182cb63002878f3bb7bcebbb8bd (diff)
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 <rpeterso@redhat.com>
Diffstat (limited to 'fs/gfs2/super.c')
-rw-r--r--fs/gfs2/super.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/fs/gfs2/super.c b/fs/gfs2/super.c
index a6bf8f1e083e..68d934fa0f9f 100644
--- a/fs/gfs2/super.c
+++ b/fs/gfs2/super.c
@@ -1401,6 +1401,8 @@ out_unlock:
fs_warn(sdp, "gfs2_evict_inode: %d\n", error);
out:
truncate_inode_pages_final(&inode->i_data);
+ if (ip->i_qadata)
+ gfs2_assert_warn(sdp, ip->i_qadata->qa_ref == 0);
gfs2_rsqa_delete(ip, NULL);
gfs2_ordered_del_inode(ip);
clear_inode(inode);