From ce03f12b37c0bd81ad707d3642241cc55c944711 Mon Sep 17 00:00:00 2001 From: David Teigland Date: Mon, 2 Apr 2007 12:12:55 -0500 Subject: [PATCH] [DLM] change lkid format A lock id is a uint32 and is used as an opaque reference to the lock. For userland apps, the lkid is passed up, through libdlm, as the return value from a write() on the dlm device. This created a problem when the high bit was 1, making the lkid look like an error. This is fixed by changing how the lkid is composed. The low 16 bits identified the hash bucket for the lock and the high 16 bits were a per-bucket counter (which eventually hit 0x8000 causing the problem). These are simply swapped around; the number of hash table buckets is far below 0x8000, making all lkid's positive when viewed as signed. Signed-off-by: David Teigland Signed-off-by: Steven Whitehouse --- fs/dlm/lock.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/fs/dlm/lock.c b/fs/dlm/lock.c index 9d26b3a39671..eac54d230fdc 100644 --- a/fs/dlm/lock.c +++ b/fs/dlm/lock.c @@ -580,7 +580,7 @@ static int create_lkb(struct dlm_ls *ls, struct dlm_lkb **lkb_ret) /* counter can roll over so we must verify lkid is not in use */ while (lkid == 0) { - lkid = bucket | (ls->ls_lkbtbl[bucket].counter++ << 16); + lkid = (bucket << 16) | ls->ls_lkbtbl[bucket].counter++; list_for_each_entry(tmp, &ls->ls_lkbtbl[bucket].list, lkb_idtbl_list) { @@ -601,8 +601,8 @@ static int create_lkb(struct dlm_ls *ls, struct dlm_lkb **lkb_ret) static struct dlm_lkb *__find_lkb(struct dlm_ls *ls, uint32_t lkid) { - uint16_t bucket = lkid & 0xFFFF; struct dlm_lkb *lkb; + uint16_t bucket = (lkid >> 16); list_for_each_entry(lkb, &ls->ls_lkbtbl[bucket].list, lkb_idtbl_list) { if (lkb->lkb_id == lkid) @@ -614,7 +614,7 @@ static struct dlm_lkb *__find_lkb(struct dlm_ls *ls, uint32_t lkid) static int find_lkb(struct dlm_ls *ls, uint32_t lkid, struct dlm_lkb **lkb_ret) { struct dlm_lkb *lkb; - uint16_t bucket = lkid & 0xFFFF; + uint16_t bucket = (lkid >> 16); if (bucket >= ls->ls_lkbtbl_size) return -EBADSLT; @@ -644,7 +644,7 @@ static void kill_lkb(struct kref *kref) static int __put_lkb(struct dlm_ls *ls, struct dlm_lkb *lkb) { - uint16_t bucket = lkb->lkb_id & 0xFFFF; + uint16_t bucket = (lkb->lkb_id >> 16); write_lock(&ls->ls_lkbtbl[bucket].lock); if (kref_put(&lkb->lkb_ref, kill_lkb)) { -- GitLab