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Wire the sysctl output buffer before grabbing any locks to prevent

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SYSCTL_OUT() from blocking while locks are held.  This should
only be done when it would be inconvenient to make a temporary copy of
the data and defer calling SYSCTL_OUT() until after the locks are
released.
This commit is contained in:
Don Lewis 2002-07-28 19:59:31 +00:00
parent b44ba1a844
commit 5c38b6dbce
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=100831
9 changed files with 15 additions and 0 deletions
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1
sys/kern/kern_descrip.c
View File

@ -2043,6 +2043,7 @@ sysctl_kern_file(SYSCTL_HANDLER_ARGS)
int error;
struct file *fp;
sysctl_wire_old_buffer(req, 0);
sx_slock(&filelist_lock);
if (!req->oldptr) {
/*

1
sys/kern/kern_fork.c
View File

@ -193,6 +193,7 @@ sysctl_kern_randompid(SYSCTL_HANDLER_ARGS)
{
int error, pid;
sysctl_wire_old_buffer(req, sizeof(int));
sx_xlock(&allproc_lock);
pid = randompid;
error = sysctl_handle_int(oidp, &pid, 0, req);

1
sys/kern/kern_proc.c
View File

@ -1023,6 +1023,7 @@ sysctl_kern_proc(SYSCTL_HANDLER_ARGS)
if (error)
return (error);
}
sysctl_wire_old_buffer(req, 0);
sx_slock(&allproc_lock);
for (doingzomb=0 ; doingzomb < 2 ; doingzomb++) {
if (!doingzomb)

1
sys/kern/vfs_subr.c
View File

@ -2652,6 +2652,7 @@ sysctl_vnode(SYSCTL_HANDLER_ARGS)
return (SYSCTL_OUT(req, 0,
(numvnodes + KINFO_VNODESLOP) * (VPTRSZ + VNODESZ)));
sysctl_wire_old_buffer(req, 0);
mtx_lock(&mountlist_mtx);
for (mp = TAILQ_FIRST(&mountlist); mp != NULL; mp = nmp) {
if (vfs_busy(mp, LK_NOWAIT, &mountlist_mtx, td)) {

3
sys/netinet/tcp_subr.c
View File

@ -841,6 +841,9 @@ tcp_pcblist(SYSCTL_HANDLER_ARGS)
INP_INFO_RUNLOCK(&tcbinfo);
splx(s);
sysctl_wire_old_buffer(req, 2 * (sizeof xig)
+ n * sizeof(struct xtcpcb));
xig.xig_len = sizeof xig;
xig.xig_count = n;
xig.xig_gen = gencnt;

3
sys/netinet/tcp_timewait.c
View File

@ -841,6 +841,9 @@ tcp_pcblist(SYSCTL_HANDLER_ARGS)
INP_INFO_RUNLOCK(&tcbinfo);
splx(s);
sysctl_wire_old_buffer(req, 2 * (sizeof xig)
+ n * sizeof(struct xtcpcb));
xig.xig_len = sizeof xig;
xig.xig_count = n;
xig.xig_gen = gencnt;

3
sys/netinet/udp_usrreq.c
View File

@ -598,6 +598,9 @@ udp_pcblist(SYSCTL_HANDLER_ARGS)
n = udbinfo.ipi_count;
splx(s);
sysctl_wire_old_buffer(req, 2 * (sizeof xig)
+ n * sizeof(struct xinpcb));
xig.xig_len = sizeof xig;
xig.xig_count = n;
xig.xig_gen = gencnt;

1
sys/netncp/ncp_conn.c
View File

@ -633,6 +633,7 @@ ncp_sysctl_connstat(SYSCTL_HANDLER_ARGS) {
/* struct ucred *cred = req->p->p_ucred;*/
error = 0;
sysctl_wire_old_buffer(req, 0);
ncp_conn_locklist(LK_SHARED, req->p);
error = SYSCTL_OUT(req, &ncp_conn_cnt, sizeof(ncp_conn_cnt));
SLIST_FOREACH(ncp, &conn_list, nc_next) {

1
sys/netsmb/smb_conn.c
View File

@ -834,6 +834,7 @@ smb_sysctl_treedump(SYSCTL_HANDLER_ARGS)
int error, itype;
smb_makescred(&scred, td, td->td_ucred);
sysctl_wire_old_buffer(req, 0);
error = smb_sm_lockvclist(LK_SHARED, td);
if (error)
return error;