[DLM] Remove range locks from the DLM

This patch removes support for range locking from the DLM

Signed-off-by: David Teigland <teigland@redhat.com>
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>

1 files changed, 9 insertions, 94 deletions

diff --git a/fs/dlm/lock.c b/fs/dlm/lock.c
index 29d3b95dbb63..80487703d582 100644
--- a/fs/dlm/lock.c
+++ b/fs/dlm/lock.c
@@ -606,8 +606,6 @@ static int put_lkb(struct dlm_lkb *lkb)
                 /* for local/process lkbs, lvbptr points to caller's lksb */
                 if (lkb->lkb_lvbptr && is_master_copy(lkb))
                         free_lvb(lkb->lkb_lvbptr);
-                if (lkb->lkb_range)
-                        free_range(lkb->lkb_range);
                 free_lkb(lkb);
                 return 1;
         } else {
@@ -988,11 +986,6 @@ static void _grant_lock(struct dlm_rsb *r, struct dlm_lkb *lkb)
         }
 
         lkb->lkb_rqmode = DLM_LOCK_IV;
-
-        if (lkb->lkb_range) {
-                lkb->lkb_range[GR_RANGE_START] = lkb->lkb_range[RQ_RANGE_START];
-                lkb->lkb_range[GR_RANGE_END] = lkb->lkb_range[RQ_RANGE_END];
-        }
 }
 
 static void grant_lock(struct dlm_rsb *r, struct dlm_lkb *lkb)
@@ -1032,21 +1025,6 @@ static inline int first_in_list(struct dlm_lkb *lkb, struct list_head *head)
         return 0;
 }
 
-/* Return 1 if the locks' ranges overlap.  If the lkb has no range then it is
-   assumed to cover 0-ffffffff.ffffffff */
-
-static inline int ranges_overlap(struct dlm_lkb *lkb1, struct dlm_lkb *lkb2)
-{
-        if (!lkb1->lkb_range || !lkb2->lkb_range)
-                return 1;
-
-        if (lkb1->lkb_range[RQ_RANGE_END] < lkb2->lkb_range[GR_RANGE_START] ||
-            lkb1->lkb_range[RQ_RANGE_START] > lkb2->lkb_range[GR_RANGE_END])
-                return 0;
-
-        return 1;
-}
-
 /* Check if the given lkb conflicts with another lkb on the queue. */
 
 static int queue_conflict(struct list_head *head, struct dlm_lkb *lkb)
@@ -1056,7 +1034,7 @@ static int queue_conflict(struct list_head *head, struct dlm_lkb *lkb)
         list_for_each_entry(this, head, lkb_statequeue) {
                 if (this == lkb)
                         continue;
-                if (ranges_overlap(lkb, this) && !modes_compat(this, lkb))
+                if (!modes_compat(this, lkb))
                         return 1;
         }
         return 0;
@@ -1099,9 +1077,6 @@ static int conversion_deadlock_detect(struct dlm_rsb *rsb, struct dlm_lkb *lkb)
                         continue;
                 }
 
-                if (!ranges_overlap(lkb, this))
-                        continue;
-
                 if (!modes_compat(this, lkb) && !modes_compat(lkb, this))
                         return 1;
         }
@@ -1203,8 +1178,8 @@ static int _can_be_granted(struct dlm_rsb *r, struct dlm_lkb *lkb, int now)
                 return 1;
 
         /*
-         * When using range locks the NOORDER flag is set to avoid the standard
-         * vms rules on grant order.
+         * The NOORDER flag is set to avoid the standard vms rules on grant
+         * order.
          */
 
         if (lkb->lkb_exflags & DLM_LKF_NOORDER)
@@ -1358,8 +1333,7 @@ static void grant_pending_locks(struct dlm_rsb *r)
         /*
          * If there are locks left on the wait/convert queue then send blocking
          * ASTs to granted locks based on the largest requested mode (high)
-         * found above.  This can generate spurious blocking ASTs for range
-         * locks. FIXME: highbast < high comparison not valid for PR/CW.
+         * found above. FIXME: highbast < high comparison not valid for PR/CW.
          */
 
         list_for_each_entry_safe(lkb, s, &r->res_grantqueue, lkb_statequeue) {
@@ -1379,7 +1353,7 @@ static void send_bast_queue(struct dlm_rsb *r, struct list_head *head,
         list_for_each_entry(gr, head, lkb_statequeue) {
                 if (gr->lkb_bastaddr &&
                     gr->lkb_highbast < lkb->lkb_rqmode &&
-                    ranges_overlap(lkb, gr) && !modes_compat(gr, lkb)) {
+                    !modes_compat(gr, lkb)) {
                         queue_bast(r, gr, lkb->lkb_rqmode);
                         gr->lkb_highbast = lkb->lkb_rqmode;
                 }
@@ -1530,8 +1504,7 @@ static void confirm_master(struct dlm_rsb *r, int error)
 
 static int set_lock_args(int mode, struct dlm_lksb *lksb, uint32_t flags,
                          int namelen, uint32_t parent_lkid, void *ast,
-                         void *astarg, void *bast, struct dlm_range *range,
-                         struct dlm_args *args)
+                         void *astarg, void *bast, struct dlm_args *args)
 {
         int rv = -EINVAL;
 
@@ -1590,7 +1563,6 @@ static int set_lock_args(int mode, struct dlm_lksb *lksb, uint32_t flags,
         args->bastaddr = bast;
         args->mode = mode;
         args->lksb = lksb;
-        args->range = range;
         rv = 0;
  out:
         return rv;
@@ -1637,26 +1609,6 @@ static int validate_lock_args(struct dlm_ls *ls, struct dlm_lkb *lkb,
         lkb->lkb_lksb = args->lksb;
         lkb->lkb_lvbptr = args->lksb->sb_lvbptr;
         lkb->lkb_ownpid = (int) current->pid;
-
-        rv = 0;
-        if (!args->range)
-                goto out;
-
-        if (!lkb->lkb_range) {
-                rv = -ENOMEM;
-                lkb->lkb_range = allocate_range(ls);
-                if (!lkb->lkb_range)
-                        goto out;
-                /* This is needed for conversions that contain ranges
-                   where the original lock didn't but it's harmless for
-                   new locks too. */
-                lkb->lkb_range[GR_RANGE_START] = 0LL;
-                lkb->lkb_range[GR_RANGE_END] = 0xffffffffffffffffULL;
-        }
-
-        lkb->lkb_range[RQ_RANGE_START] = args->range->ra_start;
-        lkb->lkb_range[RQ_RANGE_END] = args->range->ra_end;
-        lkb->lkb_flags |= DLM_IFL_RANGE;
         rv = 0;
  out:
         return rv;
@@ -1805,7 +1757,7 @@ static int _request_lock(struct dlm_rsb *r, struct dlm_lkb *lkb)
         return error;
 }
 
-/* change some property of an existing lkb, e.g. mode, range */
+/* change some property of an existing lkb, e.g. mode */
 
 static int _convert_lock(struct dlm_rsb *r, struct dlm_lkb *lkb)
 {
@@ -1962,8 +1914,7 @@ int dlm_lock(dlm_lockspace_t *lockspace,
              uint32_t parent_lkid,
              void (*ast) (void *astarg),
              void *astarg,
-             void (*bast) (void *astarg, int mode),
-             struct dlm_range *range)
+             void (*bast) (void *astarg, int mode))
 {
         struct dlm_ls *ls;
         struct dlm_lkb *lkb;
@@ -1985,7 +1936,7 @@ int dlm_lock(dlm_lockspace_t *lockspace,
                 goto out;
 
         error = set_lock_args(mode, lksb, flags, namelen, parent_lkid, ast,
-                              astarg, bast, range, &args);
+                              astarg, bast, &args);
         if (error)
                 goto out_put;
 
@@ -2154,11 +2105,6 @@ static void send_args(struct dlm_rsb *r, struct dlm_lkb *lkb,
         if (lkb->lkb_astaddr)
                 ms->m_asts |= AST_COMP;
 
-        if (lkb->lkb_range) {
-                ms->m_range[0] = lkb->lkb_range[RQ_RANGE_START];
-                ms->m_range[1] = lkb->lkb_range[RQ_RANGE_END];
-        }
-
         if (ms->m_type == DLM_MSG_REQUEST || ms->m_type == DLM_MSG_LOOKUP)
                 memcpy(ms->m_extra, r->res_name, r->res_length);
 
@@ -2402,20 +2348,6 @@ static int receive_extralen(struct dlm_message *ms)
         return (ms->m_header.h_length - sizeof(struct dlm_message));
 }
 
-static int receive_range(struct dlm_ls *ls, struct dlm_lkb *lkb,
-                         struct dlm_message *ms)
-{
-        if (lkb->lkb_flags & DLM_IFL_RANGE) {
-                if (!lkb->lkb_range)
-                        lkb->lkb_range = allocate_range(ls);
-                if (!lkb->lkb_range)
-                        return -ENOMEM;
-                lkb->lkb_range[RQ_RANGE_START] = ms->m_range[0];
-                lkb->lkb_range[RQ_RANGE_END] = ms->m_range[1];
-        }
-        return 0;
-}
-
 static int receive_lvb(struct dlm_ls *ls, struct dlm_lkb *lkb,
                        struct dlm_message *ms)
 {
@@ -2445,9 +2377,6 @@ static int receive_request_args(struct dlm_ls *ls, struct dlm_lkb *lkb,
 
         DLM_ASSERT(is_master_copy(lkb), dlm_print_lkb(lkb););
 
-        if (receive_range(ls, lkb, ms))
-                return -ENOMEM;
-
         if (receive_lvb(ls, lkb, ms))
                 return -ENOMEM;
 
@@ -2470,13 +2399,6 @@ static int receive_convert_args(struct dlm_ls *ls, struct dlm_lkb *lkb,
         if (lkb->lkb_status != DLM_LKSTS_GRANTED)
                 return -EBUSY;
 
-        if (receive_range(ls, lkb, ms))
-                return -ENOMEM;
-        if (lkb->lkb_range) {
-                lkb->lkb_range[GR_RANGE_START] = 0LL;
-                lkb->lkb_range[GR_RANGE_END] = 0xffffffffffffffffULL;
-        }
-
         if (receive_lvb(ls, lkb, ms))
                 return -ENOMEM;
 
@@ -3476,13 +3398,6 @@ static int receive_rcom_lock_args(struct dlm_ls *ls, struct dlm_lkb *lkb,
         lkb->lkb_bastaddr = (void *) (long) (rl->rl_asts & AST_BAST);
         lkb->lkb_astaddr = (void *) (long) (rl->rl_asts & AST_COMP);
 
-        if (lkb->lkb_flags & DLM_IFL_RANGE) {
-                lkb->lkb_range = allocate_range(ls);
-                if (!lkb->lkb_range)
-                        return -ENOMEM;
-                memcpy(lkb->lkb_range, rl->rl_range, 4*sizeof(uint64_t));
-        }
-
         if (lkb->lkb_exflags & DLM_LKF_VALBLK) {
                 lkb->lkb_lvbptr = allocate_lvb(ls);
                 if (!lkb->lkb_lvbptr)