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gfs2: read-only mounts should grab the sd_freeze_gl glock 

Before this patch, only read-write mounts would grab the freeze
glock in read-only mode, as part of gfs2_make_fs_rw. So the freeze
glock was never initialized. That meant requests to freeze, which
request the glock in EX, were granted without any state transition.
That meant you could mount a gfs2 file system, which is currently
frozen on a different cluster node, in read-only mode.

This patch makes read-only mounts lock the freeze glock in SH mode,
which will block for file systems that are frozen on another node.

Signed-off-by: Bob Peterson <rpeterso@redhat.com>
This commit is contained in:
Bob Peterson 2020-06-25 13:30:18 -05:00 committed by Andreas Gruenbacher
parent 541656d3a5
commit b780cc615b
1 changed files with 11 additions and 1 deletions
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12
fs/gfs2/ops_fstype.c
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@ -1136,7 +1136,17 @@ static int gfs2_fill_super(struct super_block *sb, struct fs_context *fc)
goto fail_per_node;
}
if (!sb_rdonly(sb)) {
if (sb_rdonly(sb)) {
struct gfs2_holder freeze_gh;
error = gfs2_glock_nq_init(sdp->sd_freeze_gl, LM_ST_SHARED,
GL_EXACT, &freeze_gh);
if (error) {
fs_err(sdp, "can't make FS RO: %d\n", error);
goto fail_per_node;
}
gfs2_glock_dq_uninit(&freeze_gh);
} else {
error = gfs2_make_fs_rw(sdp);
if (error) {
fs_err(sdp, "can't make FS RW: %d\n", error);