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OpenCloudOS-Kernel
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GFS2: Wait for iopen glock dequeues 

This patch changes every glock_dq for iopen glocks into a dq_wait.
This makes sure that iopen glocks do not outlive the inode itself.
In turn, that ensures that anyone trying to unlink the glock will
be able to find the inode when it receives a remote iopen callback.

Signed-off-by: Bob Peterson <rpeterso@redhat.com>
Acked-by: Steven Whitehouse <swhiteho@redhat.com>
This commit is contained in:
Bob Peterson 2015-12-07 15:10:42 -06:00
parent 400ac52e80
commit 86d067a797
2 changed files with 7 additions and 4 deletions
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3
fs/gfs2/inode.c
View File

@ -191,7 +191,8 @@ struct inode *gfs2_inode_lookup(struct super_block *sb, unsigned int type,
fail_refresh:
ip->i_iopen_gh.gh_flags |= GL_NOCACHE;
ip->i_iopen_gh.gh_gl->gl_object = NULL;
gfs2_glock_dq_uninit(&ip->i_iopen_gh);
gfs2_glock_dq_wait(&ip->i_iopen_gh);
gfs2_holder_uninit(&ip->i_iopen_gh);
fail_iopen:
if (io_gl)
gfs2_glock_put(io_gl);

8
fs/gfs2/super.c
View File

@ -1533,7 +1533,8 @@ static void gfs2_evict_inode(struct inode *inode)
error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_SKIP, &gh);
if (unlikely(error)) {
ip->i_iopen_gh.gh_flags |= GL_NOCACHE;
gfs2_glock_dq_uninit(&ip->i_iopen_gh);
gfs2_glock_dq_wait(&ip->i_iopen_gh);
gfs2_holder_uninit(&ip->i_iopen_gh);
goto out;
}
@ -1605,7 +1606,7 @@ out_unlock:
if (test_bit(HIF_HOLDER, &ip->i_iopen_gh.gh_iflags)) {
ip->i_iopen_gh.gh_flags |= GL_NOCACHE;
gfs2_glock_dq(&ip->i_iopen_gh);
gfs2_glock_dq_wait(&ip->i_iopen_gh);
}
gfs2_holder_uninit(&ip->i_iopen_gh);
gfs2_glock_dq_uninit(&gh);
@ -1626,7 +1627,8 @@ out:
if (ip->i_iopen_gh.gh_gl) {
ip->i_iopen_gh.gh_gl->gl_object = NULL;
ip->i_iopen_gh.gh_flags |= GL_NOCACHE;
gfs2_glock_dq_uninit(&ip->i_iopen_gh);
gfs2_glock_dq_wait(&ip->i_iopen_gh);
gfs2_holder_uninit(&ip->i_iopen_gh);
}
}