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| author | Bob Peterson <rpeterso@redhat.com> | 2020-02-27 12:47:53 -0600 |
|---|---|---|
| committer | Bob Peterson <rpeterso@redhat.com> | 2020-03-27 14:08:04 -0500 |
| commit | 2fba46a04c383f91e7fe837d43bf1ab33ce32b6a (patch) | |
| tree | 3137e791a08473e956a2a6ac477cb20b8677081b /fs/gfs2/incore.h | |
| parent | d580712a37272182cb63002878f3bb7bcebbb8bd (diff) | |
| download | linux-2fba46a04c383f91e7fe837d43bf1ab33ce32b6a.tar.bz2 | |
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/incore.h')
| -rw-r--r-- | fs/gfs2/incore.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/fs/gfs2/incore.h b/fs/gfs2/incore.h index 04549a8cae7e..84a824293a78 100644 --- a/fs/gfs2/incore.h +++ b/fs/gfs2/incore.h @@ -295,6 +295,7 @@ struct gfs2_qadata { /* quota allocation data */ struct gfs2_quota_data *qa_qd[2 * GFS2_MAXQUOTAS]; struct gfs2_holder qa_qd_ghs[2 * GFS2_MAXQUOTAS]; unsigned int qa_qd_num; + int qa_ref; }; /* Resource group multi-block reservation, in order of appearance: |