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Scan all processes for that might be blocked on a lock

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This commit is contained in:
Thomas Veerman 2010-04-28 11:54:22 +00:00
parent b65ebdffac
commit f9317dc039
1 changed files with 4 additions and 3 deletions
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7
servers/vfs/lock.c
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@ -58,6 +58,7 @@ int req; /* either F_SETLK or F_SETLKW */
case SEEK_END: first = f->filp_vno->v_size; break;
default: return(EINVAL);
}
/* Check for overflow. */
if (((long)flock.l_start > 0) && ((first + flock.l_start) < first))
return(EINVAL);
@ -70,7 +71,7 @@ int req; /* either F_SETLK or F_SETLKW */
/* Check if this region conflicts with any existing lock. */
empty = NIL_LOCK;
for (flp = &file_lock[0]; flp < & file_lock[NR_LOCKS]; flp++) {
for (flp = &file_lock[0]; flp < &file_lock[NR_LOCKS]; flp++) {
if (flp->lock_type == 0) {
if (empty == NIL_LOCK) empty = flp;
continue; /* 0 means unused slot */
@ -154,7 +155,7 @@ int req; /* either F_SETLK or F_SETLKW */
if (ltype == F_UNLCK) return(OK); /* unlocked a region with no locks */
/* There is no conflict. If space exists, store new lock in the table. */
if (empty == (struct file_lock *) 0) return(ENOLCK); /* table full */
if (empty == NIL_LOCK) return(ENOLCK); /* table full */
empty->lock_type = ltype;
empty->lock_pid = fp->fp_pid;
empty->lock_vnode = f->filp_vno;
@ -181,7 +182,7 @@ PUBLIC void lock_revive()
struct fproc *fptr;
for (fptr = &fproc[INIT_PROC_NR + 1]; fptr < &fproc[NR_PROCS]; fptr++){
for (fptr = &fproc[0]; fptr < &fproc[NR_PROCS]; fptr++){
if(fptr->fp_pid == PID_FREE) continue;
if (fptr->fp_blocked_on == FP_BLOCKED_ON_LOCK) {
revive(fptr->fp_endpoint, 0);