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ocfs2: Use -errno instead of dlm_status for ocfs2_dlm_lock/unlock() API.
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Change the ocfs2_dlm_lock/unlock() functions to return -errno values.
This is the first step towards elminiating dlm_status in
fs/ocfs2/dlmglue.c.  The change also passes -errno values to
->unlock_ast().

[ Fix a return code in dlmglue.c and change the error translation table into
  an array of ints. --Mark ]

Signed-off-by: Joel Becker <joel.becker@oracle.com>
Signed-off-by: Mark Fasheh <mfasheh@suse.com>
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Joel Becker authored and Mark Fasheh committed Apr 18, 2008
1 parent bd3e761 commit 7431cd7
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Showing 3 changed files with 188 additions and 76 deletions.
116 changes: 50 additions & 66 deletions fs/ocfs2/dlmglue.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -329,10 +329,9 @@ static void ocfs2_schedule_blocked_lock(struct ocfs2_super *osb,
struct ocfs2_lock_res *lockres);
static inline void ocfs2_recover_from_dlm_error(struct ocfs2_lock_res *lockres,
int convert);
#define ocfs2_log_dlm_error(_func, _stat, _lockres) do { \
mlog(ML_ERROR, "Dlm error \"%s\" while calling %s on " \
"resource %s: %s\n", dlm_errname(_stat), _func, \
_lockres->l_name, dlm_errmsg(_stat)); \
#define ocfs2_log_dlm_error(_func, _err, _lockres) do { \
mlog(ML_ERROR, "DLM error %d while calling %s on resource %s\n", \
_err, _func, _lockres->l_name); \
} while (0)
static int ocfs2_downconvert_thread(void *arg);
static void ocfs2_downconvert_on_unlock(struct ocfs2_super *osb,
Expand Down Expand Up @@ -867,7 +866,6 @@ static int ocfs2_lock_create(struct ocfs2_super *osb,
u32 dlm_flags)
{
int ret = 0;
enum dlm_status status = DLM_NORMAL;
unsigned long flags;

mlog_entry_void();
Expand All @@ -887,21 +885,19 @@ static int ocfs2_lock_create(struct ocfs2_super *osb,
lockres_or_flags(lockres, OCFS2_LOCK_BUSY);
spin_unlock_irqrestore(&lockres->l_lock, flags);

status = ocfs2_dlm_lock(osb->dlm,
level,
&lockres->l_lksb,
dlm_flags,
lockres->l_name,
OCFS2_LOCK_ID_MAX_LEN - 1,
lockres);
if (status != DLM_NORMAL) {
ocfs2_log_dlm_error("ocfs2_dlm_lock", status, lockres);
ret = -EINVAL;
ret = ocfs2_dlm_lock(osb->dlm,
level,
&lockres->l_lksb,
dlm_flags,
lockres->l_name,
OCFS2_LOCK_ID_MAX_LEN - 1,
lockres);
if (ret) {
ocfs2_log_dlm_error("ocfs2_dlm_lock", ret, lockres);
ocfs2_recover_from_dlm_error(lockres, 1);
}

mlog(0, "lock %s, successfull return from ocfs2_dlm_lock\n",
lockres->l_name);
mlog(0, "lock %s, return from ocfs2_dlm_lock\n", lockres->l_name);

bail:
mlog_exit(ret);
Expand Down Expand Up @@ -1018,7 +1014,6 @@ static int ocfs2_cluster_lock(struct ocfs2_super *osb,
int arg_flags)
{
struct ocfs2_mask_waiter mw;
enum dlm_status status;
int wait, catch_signals = !(osb->s_mount_opt & OCFS2_MOUNT_NOINTR);
int ret = 0; /* gcc doesn't realize wait = 1 guarantees ret is set */
unsigned long flags;
Expand Down Expand Up @@ -1089,21 +1084,18 @@ static int ocfs2_cluster_lock(struct ocfs2_super *osb,
lockres->l_name, lockres->l_level, level);

/* call dlm_lock to upgrade lock now */
status = ocfs2_dlm_lock(osb->dlm,
level,
&lockres->l_lksb,
lkm_flags,
lockres->l_name,
OCFS2_LOCK_ID_MAX_LEN - 1,
lockres);
if (status != DLM_NORMAL) {
if ((lkm_flags & DLM_LKF_NOQUEUE) &&
(status == DLM_NOTQUEUED))
ret = -EAGAIN;
else {
ret = ocfs2_dlm_lock(osb->dlm,
level,
&lockres->l_lksb,
lkm_flags,
lockres->l_name,
OCFS2_LOCK_ID_MAX_LEN - 1,
lockres);
if (ret) {
if (!(lkm_flags & DLM_LKF_NOQUEUE) ||
(ret != -EAGAIN)) {
ocfs2_log_dlm_error("ocfs2_dlm_lock",
status, lockres);
ret = -EINVAL;
ret, lockres);
}
ocfs2_recover_from_dlm_error(lockres, 1);
goto out;
Expand Down Expand Up @@ -1502,10 +1494,8 @@ int ocfs2_file_lock(struct file *file, int ex, int trylock)
ret = ocfs2_dlm_lock(osb->dlm, level, &lockres->l_lksb, lkm_flags,
lockres->l_name, OCFS2_LOCK_ID_MAX_LEN - 1,
lockres);
if (ret != DLM_NORMAL) {
if (trylock && ret == DLM_NOTQUEUED)
ret = -EAGAIN;
else {
if (ret) {
if (!trylock || (ret != -EAGAIN)) {
ocfs2_log_dlm_error("ocfs2_dlm_lock", ret, lockres);
ret = -EINVAL;
}
Expand Down Expand Up @@ -2573,7 +2563,7 @@ void ocfs2_dlm_shutdown(struct ocfs2_super *osb)
mlog_exit_void();
}

static void ocfs2_unlock_ast(void *opaque, enum dlm_status status)
static void ocfs2_unlock_ast(void *opaque, int error)
{
struct ocfs2_lock_res *lockres = opaque;
unsigned long flags;
Expand All @@ -2589,7 +2579,7 @@ static void ocfs2_unlock_ast(void *opaque, enum dlm_status status)
* state. The wake_up call done at the bottom is redundant
* (ocfs2_prepare_cancel_convert doesn't sleep on this) but doesn't
* hurt anything anyway */
if (status == DLM_CANCELGRANT &&
if (error == -DLM_ECANCEL &&
lockres->l_unlock_action == OCFS2_UNLOCK_CANCEL_CONVERT) {
mlog(0, "Got cancelgrant for %s\n", lockres->l_name);

Expand All @@ -2599,9 +2589,10 @@ static void ocfs2_unlock_ast(void *opaque, enum dlm_status status)
goto complete_unlock;
}

if (status != DLM_NORMAL) {
mlog(ML_ERROR, "Dlm passes status %d for lock %s, "
"unlock_action %d\n", status, lockres->l_name,
/* DLM_EUNLOCK is the success code for unlock */
if (error != -DLM_EUNLOCK) {
mlog(ML_ERROR, "Dlm passes error %d for lock %s, "
"unlock_action %d\n", error, lockres->l_name,
lockres->l_unlock_action);
spin_unlock_irqrestore(&lockres->l_lock, flags);
return;
Expand Down Expand Up @@ -2632,7 +2623,7 @@ static void ocfs2_unlock_ast(void *opaque, enum dlm_status status)
static int ocfs2_drop_lock(struct ocfs2_super *osb,
struct ocfs2_lock_res *lockres)
{
enum dlm_status status;
int ret;
unsigned long flags;
u32 lkm_flags = 0;

Expand Down Expand Up @@ -2696,10 +2687,10 @@ static int ocfs2_drop_lock(struct ocfs2_super *osb,

mlog(0, "lock %s\n", lockres->l_name);

status = ocfs2_dlm_unlock(osb->dlm, &lockres->l_lksb, lkm_flags,
lockres);
if (status != DLM_NORMAL) {
ocfs2_log_dlm_error("ocfs2_dlm_unlock", status, lockres);
ret = ocfs2_dlm_unlock(osb->dlm, &lockres->l_lksb, lkm_flags,
lockres);
if (ret) {
ocfs2_log_dlm_error("ocfs2_dlm_unlock", ret, lockres);
mlog(ML_ERROR, "lockres flags: %lu\n", lockres->l_flags);
dlm_print_one_lock(lockres->l_lksb.lockid);
BUG();
Expand Down Expand Up @@ -2823,23 +2814,21 @@ static int ocfs2_downconvert_lock(struct ocfs2_super *osb,
{
int ret;
u32 dlm_flags = DLM_LKF_CONVERT;
enum dlm_status status;

mlog_entry_void();

if (lvb)
dlm_flags |= DLM_LKF_VALBLK;

status = ocfs2_dlm_lock(osb->dlm,
new_level,
&lockres->l_lksb,
dlm_flags,
lockres->l_name,
OCFS2_LOCK_ID_MAX_LEN - 1,
lockres);
if (status != DLM_NORMAL) {
ocfs2_log_dlm_error("ocfs2_dlm_lock", status, lockres);
ret = -EINVAL;
ret = ocfs2_dlm_lock(osb->dlm,
new_level,
&lockres->l_lksb,
dlm_flags,
lockres->l_name,
OCFS2_LOCK_ID_MAX_LEN - 1,
lockres);
if (ret) {
ocfs2_log_dlm_error("ocfs2_dlm_lock", ret, lockres);
ocfs2_recover_from_dlm_error(lockres, 1);
goto bail;
}
Expand Down Expand Up @@ -2886,19 +2875,14 @@ static int ocfs2_cancel_convert(struct ocfs2_super *osb,
struct ocfs2_lock_res *lockres)
{
int ret;
enum dlm_status status;

mlog_entry_void();
mlog(0, "lock %s\n", lockres->l_name);

ret = 0;
status = ocfs2_dlm_unlock(osb->dlm,
&lockres->l_lksb,
DLM_LKF_CANCEL,
lockres);
if (status != DLM_NORMAL) {
ocfs2_log_dlm_error("ocfs2_dlm_unlock", status, lockres);
ret = -EINVAL;
ret = ocfs2_dlm_unlock(osb->dlm, &lockres->l_lksb,
DLM_LKF_CANCEL, lockres);
if (ret) {
ocfs2_log_dlm_error("ocfs2_dlm_unlock", ret, lockres);
ocfs2_recover_from_dlm_error(lockres, 0);
}

Expand Down
142 changes: 135 additions & 7 deletions fs/ocfs2/stackglue.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -18,6 +18,7 @@
* General Public License for more details.
*/

#include "cluster/masklog.h"
#include "stackglue.h"

static struct ocfs2_locking_protocol *lproto;
Expand Down Expand Up @@ -77,35 +78,162 @@ static int flags_to_o2dlm(u32 flags)
}
#undef map_flag

enum dlm_status ocfs2_dlm_lock(struct dlm_ctxt *dlm,
/*
* Map an o2dlm status to standard errno values.
*
* o2dlm only uses a handful of these, and returns even fewer to the
* caller. Still, we try to assign sane values to each error.
*
* The following value pairs have special meanings to dlmglue, thus
* the right hand side needs to stay unique - never duplicate the
* mapping elsewhere in the table!
*
* DLM_NORMAL: 0
* DLM_NOTQUEUED: -EAGAIN
* DLM_CANCELGRANT: -DLM_ECANCEL
* DLM_CANCEL: -DLM_EUNLOCK
*/
/* Keep in sync with dlmapi.h */
static int status_map[] = {
[DLM_NORMAL] = 0, /* Success */
[DLM_GRANTED] = -EINVAL,
[DLM_DENIED] = -EACCES,
[DLM_DENIED_NOLOCKS] = -EACCES,
[DLM_WORKING] = -EBUSY,
[DLM_BLOCKED] = -EINVAL,
[DLM_BLOCKED_ORPHAN] = -EINVAL,
[DLM_DENIED_GRACE_PERIOD] = -EACCES,
[DLM_SYSERR] = -ENOMEM, /* It is what it is */
[DLM_NOSUPPORT] = -EPROTO,
[DLM_CANCELGRANT] = -DLM_ECANCEL, /* Cancel after grant */
[DLM_IVLOCKID] = -EINVAL,
[DLM_SYNC] = -EINVAL,
[DLM_BADTYPE] = -EINVAL,
[DLM_BADRESOURCE] = -EINVAL,
[DLM_MAXHANDLES] = -ENOMEM,
[DLM_NOCLINFO] = -EINVAL,
[DLM_NOLOCKMGR] = -EINVAL,
[DLM_NOPURGED] = -EINVAL,
[DLM_BADARGS] = -EINVAL,
[DLM_VOID] = -EINVAL,
[DLM_NOTQUEUED] = -EAGAIN, /* Trylock failed */
[DLM_IVBUFLEN] = -EINVAL,
[DLM_CVTUNGRANT] = -EPERM,
[DLM_BADPARAM] = -EINVAL,
[DLM_VALNOTVALID] = -EINVAL,
[DLM_REJECTED] = -EPERM,
[DLM_ABORT] = -EINVAL,
[DLM_CANCEL] = -DLM_EUNLOCK, /* Successful cancel */
[DLM_IVRESHANDLE] = -EINVAL,
[DLM_DEADLOCK] = -EDEADLK,
[DLM_DENIED_NOASTS] = -EINVAL,
[DLM_FORWARD] = -EINVAL,
[DLM_TIMEOUT] = -ETIMEDOUT,
[DLM_IVGROUPID] = -EINVAL,
[DLM_VERS_CONFLICT] = -EOPNOTSUPP,
[DLM_BAD_DEVICE_PATH] = -ENOENT,
[DLM_NO_DEVICE_PERMISSION] = -EPERM,
[DLM_NO_CONTROL_DEVICE] = -ENOENT,
[DLM_RECOVERING] = -ENOTCONN,
[DLM_MIGRATING] = -ERESTART,
[DLM_MAXSTATS] = -EINVAL,
};
static int dlm_status_to_errno(enum dlm_status status)
{
BUG_ON(status > (sizeof(status_map) / sizeof(status_map[0])));

return status_map[status];
}

static void o2dlm_lock_ast_wrapper(void *astarg)
{
BUG_ON(lproto == NULL);

lproto->lp_lock_ast(astarg);
}

static void o2dlm_blocking_ast_wrapper(void *astarg, int level)
{
BUG_ON(lproto == NULL);

lproto->lp_blocking_ast(astarg, level);
}

static void o2dlm_unlock_ast_wrapper(void *astarg, enum dlm_status status)
{
int error;

BUG_ON(lproto == NULL);

/*
* XXX: CANCEL values are sketchy.
*
* Currently we have preserved the o2dlm paradigm. You can get
* unlock_ast() whether the cancel succeded or not.
*
* First, we're going to pass DLM_EUNLOCK just like fs/dlm does for
* successful unlocks. That is a clean behavior.
*
* In o2dlm, you can get both the lock_ast() for the lock being
* granted and the unlock_ast() for the CANCEL failing. A
* successful cancel sends DLM_NORMAL here. If the
* lock grant happened before the cancel arrived, you get
* DLM_CANCELGRANT. For now, we'll use DLM_ECANCEL to signify
* CANCELGRANT - the CANCEL was supposed to happen but didn't. We
* can then use DLM_EUNLOCK to signify a successful CANCEL -
* effectively, the CANCEL caused the lock to roll back.
*
* In the future, we will likely move the o2dlm to send only one
* ast - either unlock_ast() for a successful CANCEL or lock_ast()
* when the grant succeeds. At that point, we'll send DLM_ECANCEL
* for all cancel results (CANCELGRANT will no longer exist).
*/
error = dlm_status_to_errno(status);

/* Successful unlock is DLM_EUNLOCK */
if (!error)
error = -DLM_EUNLOCK;

lproto->lp_unlock_ast(astarg, error);
}

int ocfs2_dlm_lock(struct dlm_ctxt *dlm,
int mode,
struct dlm_lockstatus *lksb,
u32 flags,
void *name,
unsigned int namelen,
void *astarg)
{
enum dlm_status status;
int o2dlm_mode = mode_to_o2dlm(mode);
int o2dlm_flags = flags_to_o2dlm(flags);
int ret;

BUG_ON(lproto == NULL);

return dlmlock(dlm, o2dlm_mode, lksb, o2dlm_flags, name, namelen,
lproto->lp_lock_ast, astarg,
lproto->lp_blocking_ast);
status = dlmlock(dlm, o2dlm_mode, lksb, o2dlm_flags, name, namelen,
o2dlm_lock_ast_wrapper, astarg,
o2dlm_blocking_ast_wrapper);
ret = dlm_status_to_errno(status);
return ret;
}

enum dlm_status ocfs2_dlm_unlock(struct dlm_ctxt *dlm,
int ocfs2_dlm_unlock(struct dlm_ctxt *dlm,
struct dlm_lockstatus *lksb,
u32 flags,
void *astarg)
{
enum dlm_status status;
int o2dlm_flags = flags_to_o2dlm(flags);
int ret;

BUG_ON(lproto == NULL);

return dlmunlock(dlm, lksb, o2dlm_flags,
lproto->lp_unlock_ast, astarg);
status = dlmunlock(dlm, lksb, o2dlm_flags,
o2dlm_unlock_ast_wrapper, astarg);
ret = dlm_status_to_errno(status);
return ret;
}


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