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path: root/fs/gfs2/lock_dlm.c
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Diffstat (limited to 'fs/gfs2/lock_dlm.c')
-rw-r--r--fs/gfs2/lock_dlm.c72
1 files changed, 55 insertions, 17 deletions
diff --git a/fs/gfs2/lock_dlm.c b/fs/gfs2/lock_dlm.c
index cee5d199d2d8..6db37c20587d 100644
--- a/fs/gfs2/lock_dlm.c
+++ b/fs/gfs2/lock_dlm.c
@@ -58,6 +58,7 @@ static inline void gfs2_update_stats(struct gfs2_lkstats *s, unsigned index,
/**
* gfs2_update_reply_times - Update locking statistics
* @gl: The glock to update
+ * @blocking: The operation may have been blocking
*
* This assumes that gl->gl_dstamp has been set earlier.
*
@@ -72,12 +73,12 @@ static inline void gfs2_update_stats(struct gfs2_lkstats *s, unsigned index,
* TRY_1CB flags are set are classified as non-blocking. All
* other DLM requests are counted as (potentially) blocking.
*/
-static inline void gfs2_update_reply_times(struct gfs2_glock *gl)
+static inline void gfs2_update_reply_times(struct gfs2_glock *gl,
+ bool blocking)
{
struct gfs2_pcpu_lkstats *lks;
const unsigned gltype = gl->gl_name.ln_type;
- unsigned index = test_bit(GLF_BLOCKING, &gl->gl_flags) ?
- GFS2_LKS_SRTTB : GFS2_LKS_SRTT;
+ unsigned index = blocking ? GFS2_LKS_SRTTB : GFS2_LKS_SRTT;
s64 rtt;
preempt_disable();
@@ -119,14 +120,18 @@ static inline void gfs2_update_request_times(struct gfs2_glock *gl)
static void gdlm_ast(void *arg)
{
struct gfs2_glock *gl = arg;
+ bool blocking;
unsigned ret;
+ blocking = test_bit(GLF_BLOCKING, &gl->gl_flags);
+ gfs2_update_reply_times(gl, blocking);
+ clear_bit(GLF_BLOCKING, &gl->gl_flags);
+
/* If the glock is dead, we only react to a dlm_unlock() reply. */
if (__lockref_is_dead(&gl->gl_lockref) &&
gl->gl_lksb.sb_status != -DLM_EUNLOCK)
return;
- gfs2_update_reply_times(gl);
BUG_ON(gl->gl_lksb.sb_flags & DLM_SBF_DEMOTED);
if ((gl->gl_lksb.sb_flags & DLM_SBF_VALNOTVALID) && gl->gl_lksb.sb_lvbptr)
@@ -241,7 +246,7 @@ static bool down_conversion(int cur, int req)
}
static u32 make_flags(struct gfs2_glock *gl, const unsigned int gfs_flags,
- const int cur, const int req)
+ const int req, bool blocking)
{
u32 lkf = 0;
@@ -274,7 +279,7 @@ static u32 make_flags(struct gfs2_glock *gl, const unsigned int gfs_flags,
* "upward" lock conversions or else DLM will reject the
* request as invalid.
*/
- if (!down_conversion(cur, req))
+ if (blocking)
lkf |= DLM_LKF_QUECVT;
}
@@ -294,14 +299,20 @@ static int gdlm_lock(struct gfs2_glock *gl, unsigned int req_state,
unsigned int flags)
{
struct lm_lockstruct *ls = &gl->gl_name.ln_sbd->sd_lockstruct;
+ bool blocking;
int cur, req;
u32 lkf;
char strname[GDLM_STRNAME_BYTES] = "";
int error;
+ gl->gl_req = req_state;
cur = make_mode(gl->gl_name.ln_sbd, gl->gl_state);
req = make_mode(gl->gl_name.ln_sbd, req_state);
- lkf = make_flags(gl, flags, cur, req);
+ blocking = !down_conversion(cur, req) &&
+ !(flags & (LM_FLAG_TRY|LM_FLAG_TRY_1CB));
+ lkf = make_flags(gl, flags, req, blocking);
+ if (blocking)
+ set_bit(GLF_BLOCKING, &gl->gl_flags);
gfs2_glstats_inc(gl, GFS2_LKS_DCOUNT);
gfs2_sbstats_inc(gl, GFS2_LKS_DCOUNT);
if (test_bit(GLF_INITIAL, &gl->gl_flags)) {
@@ -318,8 +329,13 @@ static int gdlm_lock(struct gfs2_glock *gl, unsigned int req_state,
*/
again:
- error = dlm_lock(ls->ls_dlm, req, &gl->gl_lksb, lkf, strname,
- GDLM_STRNAME_BYTES - 1, 0, gdlm_ast, gl, gdlm_bast);
+ down_read(&ls->ls_sem);
+ error = -ENODEV;
+ if (likely(ls->ls_dlm != NULL)) {
+ error = dlm_lock(ls->ls_dlm, req, &gl->gl_lksb, lkf, strname,
+ GDLM_STRNAME_BYTES - 1, 0, gdlm_ast, gl, gdlm_bast);
+ }
+ up_read(&ls->ls_sem);
if (error == -EBUSY) {
msleep(20);
goto again;
@@ -341,7 +357,6 @@ static void gdlm_put_lock(struct gfs2_glock *gl)
return;
}
- clear_bit(GLF_BLOCKING, &gl->gl_flags);
gfs2_glstats_inc(gl, GFS2_LKS_DCOUNT);
gfs2_sbstats_inc(gl, GFS2_LKS_DCOUNT);
gfs2_update_request_times(gl);
@@ -369,8 +384,13 @@ static void gdlm_put_lock(struct gfs2_glock *gl)
flags |= DLM_LKF_VALBLK;
again:
- error = dlm_unlock(ls->ls_dlm, gl->gl_lksb.sb_lkid, flags,
- NULL, gl);
+ down_read(&ls->ls_sem);
+ error = -ENODEV;
+ if (likely(ls->ls_dlm != NULL)) {
+ error = dlm_unlock(ls->ls_dlm, gl->gl_lksb.sb_lkid, flags,
+ NULL, gl);
+ }
+ up_read(&ls->ls_sem);
if (error == -EBUSY) {
msleep(20);
goto again;
@@ -386,7 +406,12 @@ again:
static void gdlm_cancel(struct gfs2_glock *gl)
{
struct lm_lockstruct *ls = &gl->gl_name.ln_sbd->sd_lockstruct;
- dlm_unlock(ls->ls_dlm, gl->gl_lksb.sb_lkid, DLM_LKF_CANCEL, NULL, gl);
+
+ down_read(&ls->ls_sem);
+ if (likely(ls->ls_dlm != NULL)) {
+ dlm_unlock(ls->ls_dlm, gl->gl_lksb.sb_lkid, DLM_LKF_CANCEL, NULL, gl);
+ }
+ up_read(&ls->ls_sem);
}
/*
@@ -567,7 +592,11 @@ static int sync_unlock(struct gfs2_sbd *sdp, struct dlm_lksb *lksb, char *name)
struct lm_lockstruct *ls = &sdp->sd_lockstruct;
int error;
- error = dlm_unlock(ls->ls_dlm, lksb->sb_lkid, 0, lksb, ls);
+ down_read(&ls->ls_sem);
+ error = -ENODEV;
+ if (likely(ls->ls_dlm != NULL))
+ error = dlm_unlock(ls->ls_dlm, lksb->sb_lkid, 0, lksb, ls);
+ up_read(&ls->ls_sem);
if (error) {
fs_err(sdp, "%s lkid %x error %d\n",
name, lksb->sb_lkid, error);
@@ -594,9 +623,14 @@ static int sync_lock(struct gfs2_sbd *sdp, int mode, uint32_t flags,
memset(strname, 0, GDLM_STRNAME_BYTES);
snprintf(strname, GDLM_STRNAME_BYTES, "%8x%16x", LM_TYPE_NONDISK, num);
- error = dlm_lock(ls->ls_dlm, mode, lksb, flags,
- strname, GDLM_STRNAME_BYTES - 1,
- 0, sync_wait_cb, ls, NULL);
+ down_read(&ls->ls_sem);
+ error = -ENODEV;
+ if (likely(ls->ls_dlm != NULL)) {
+ error = dlm_lock(ls->ls_dlm, mode, lksb, flags,
+ strname, GDLM_STRNAME_BYTES - 1,
+ 0, sync_wait_cb, ls, NULL);
+ }
+ up_read(&ls->ls_sem);
if (error) {
fs_err(sdp, "%s lkid %x flags %x mode %d error %d\n",
name, lksb->sb_lkid, flags, mode, error);
@@ -1323,6 +1357,7 @@ static int gdlm_mount(struct gfs2_sbd *sdp, const char *table)
*/
INIT_DELAYED_WORK(&sdp->sd_control_work, gfs2_control_func);
+ ls->ls_dlm = NULL;
spin_lock_init(&ls->ls_recover_spin);
ls->ls_recover_flags = 0;
ls->ls_recover_mount = 0;
@@ -1357,6 +1392,7 @@ static int gdlm_mount(struct gfs2_sbd *sdp, const char *table)
* create/join lockspace
*/
+ init_rwsem(&ls->ls_sem);
error = dlm_new_lockspace(fsname, cluster, flags, GDLM_LVB_SIZE,
&gdlm_lockspace_ops, sdp, &ops_result,
&ls->ls_dlm);
@@ -1436,10 +1472,12 @@ static void gdlm_unmount(struct gfs2_sbd *sdp)
/* mounted_lock and control_lock will be purged in dlm recovery */
release:
+ down_write(&ls->ls_sem);
if (ls->ls_dlm) {
dlm_release_lockspace(ls->ls_dlm, 2);
ls->ls_dlm = NULL;
}
+ up_write(&ls->ls_sem);
free_recover_size(ls);
}
generated by cgit v1.2.3 (git 2.39.0) at 2025-10-17 10:44:19 +0300