• Bob Peterson's avatar
    gfs2: Change inode qa_data to allow multiple users · 2fba46a0
    Bob Peterson authored
    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: default avatarBob Peterson <rpeterso@redhat.com>
    2fba46a0
incore.h 23.8 KB