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authorSteven Whitehouse <swhiteho@redhat.com>2008-05-23 14:46:04 +0100
committerSteven Whitehouse <swhiteho@redhat.com>2008-06-27 09:39:28 +0100
commit048bca223739368aa5b9ce7cfb1d576c32d66cc7 (patch)
tree66d4f1c0e90eb6429755cb4529f8c7f609026e89 /fs/gfs2/glock.c
parentf3c9d38a26be32abf9b8897e9e0afc7166c712dd (diff)
downloadconfigs-048bca223739368aa5b9ce7cfb1d576c32d66cc7.tar.gz
[GFS2] No lock_nolock
This patch merges the lock_nolock module into GFS2 itself. As well as removing some of the overhead of the module, it also means that its now impossible to build GFS2 without a lock module (which would be a pointless thing to do anyway). We also plan to merge lock_dlm into GFS2 in the future, but that is a more tricky task, and will therefore be a separate patch. Signed-off-by: Steven Whitehouse <swhiteho@redhat.com> Cc: David Teigland <teigland@redhat.com>
Diffstat (limited to 'fs/gfs2/glock.c')
-rw-r--r--fs/gfs2/glock.c15
1 files changed, 12 insertions, 3 deletions
diff --git a/fs/gfs2/glock.c b/fs/gfs2/glock.c
index 519a54cc0b7..be7ed503f01 100644
--- a/fs/gfs2/glock.c
+++ b/fs/gfs2/glock.c
@@ -153,7 +153,7 @@ static void glock_free(struct gfs2_glock *gl)
struct gfs2_sbd *sdp = gl->gl_sbd;
struct inode *aspace = gl->gl_aspace;
- if (likely(!test_bit(SDF_SHUTDOWN, &sdp->sd_flags)))
+ if (sdp->sd_lockstruct.ls_ops->lm_put_lock)
sdp->sd_lockstruct.ls_ops->lm_put_lock(gl->gl_lock);
if (aspace)
@@ -488,6 +488,10 @@ static unsigned int gfs2_lm_lock(struct gfs2_sbd *sdp, void *lock,
unsigned int flags)
{
int ret = LM_OUT_ERROR;
+
+ if (!sdp->sd_lockstruct.ls_ops->lm_lock)
+ return req_state == LM_ST_UNLOCKED ? 0 : req_state;
+
if (likely(!test_bit(SDF_SHUTDOWN, &sdp->sd_flags)))
ret = sdp->sd_lockstruct.ls_ops->lm_lock(lock, cur_state,
req_state, flags);
@@ -631,6 +635,8 @@ static int gfs2_lm_get_lock(struct gfs2_sbd *sdp, struct lm_lockname *name,
void **lockp)
{
int error = -EIO;
+ if (!sdp->sd_lockstruct.ls_ops->lm_get_lock)
+ return 0;
if (likely(!test_bit(SDF_SHUTDOWN, &sdp->sd_flags)))
error = sdp->sd_lockstruct.ls_ops->lm_get_lock(
sdp->sd_lockstruct.ls_lockspace, name, lockp);
@@ -910,7 +916,8 @@ do_cancel:
gh = list_entry(gl->gl_holders.next, struct gfs2_holder, gh_list);
if (!(gh->gh_flags & LM_FLAG_PRIORITY)) {
spin_unlock(&gl->gl_spin);
- sdp->sd_lockstruct.ls_ops->lm_cancel(gl->gl_lock);
+ if (sdp->sd_lockstruct.ls_ops->lm_cancel)
+ sdp->sd_lockstruct.ls_ops->lm_cancel(gl->gl_lock);
spin_lock(&gl->gl_spin);
}
return;
@@ -1187,6 +1194,8 @@ void gfs2_glock_dq_uninit_m(unsigned int num_gh, struct gfs2_holder *ghs)
static int gfs2_lm_hold_lvb(struct gfs2_sbd *sdp, void *lock, char **lvbp)
{
int error = -EIO;
+ if (!sdp->sd_lockstruct.ls_ops->lm_hold_lvb)
+ return 0;
if (likely(!test_bit(SDF_SHUTDOWN, &sdp->sd_flags)))
error = sdp->sd_lockstruct.ls_ops->lm_hold_lvb(lock, lvbp);
return error;
@@ -1226,7 +1235,7 @@ void gfs2_lvb_unhold(struct gfs2_glock *gl)
gfs2_glock_hold(gl);
gfs2_assert(gl->gl_sbd, atomic_read(&gl->gl_lvb_count) > 0);
if (atomic_dec_and_test(&gl->gl_lvb_count)) {
- if (likely(!test_bit(SDF_SHUTDOWN, &sdp->sd_flags)))
+ if (sdp->sd_lockstruct.ls_ops->lm_unhold_lvb)
sdp->sd_lockstruct.ls_ops->lm_unhold_lvb(gl->gl_lock, gl->gl_lvb);
gl->gl_lvb = NULL;
gfs2_glock_put(gl);