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Push Giant down through select and poll.

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Don't grab Giant in the upper syscall/wrapper code

NET_LOCK_GIANT in the socket code (sockets/fifos).

mtx_lock(&Giant) in the vnode code.

Devfs grabs Giant if the driver is marked as needing Giant.
This commit is contained in:
Poul-Henning Kamp 2004-11-17 08:01:10 +00:00
parent d533c6e9a5
commit db446e30cc
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=137805
3 changed files with 5 additions and 13 deletions
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13
sys/kern/sys_generic.c
View file

@ -625,11 +625,7 @@ kern_select(struct thread *td, int nd, fd_set *fd_in, fd_set *fd_ou,
if (nd < 0)
return (EINVAL);
fdp = td->td_proc->p_fd;
/*
* XXX: kern_select() currently requires that we acquire Giant
* even if none of the file descriptors we poll requires Giant.
*/
mtx_lock(&Giant);
FILEDESC_LOCK_FAST(fdp);
if (nd > td->td_proc->p_fd->fd_nfiles)
@ -764,7 +760,6 @@ kern_select(struct thread *td, int nd, fd_set *fd_in, fd_set *fd_ou,
if (selbits != &s_selbits[0])
free(selbits, M_SELECT);
mtx_unlock(&Giant);
return (error);
}
@ -837,11 +832,6 @@ poll(td, uap)
nfds = uap->nfds;
/*
* XXX: poll() currently requires that we acquire Giant even if
* none of the file descriptors we poll requires Giant.
*/
mtx_lock(&Giant);
/*
* This is kinda bogus. We have fd limits, but that is not
* really related to the size of the pollfd array. Make sure
@ -943,7 +933,6 @@ poll(td, uap)
if (ni > sizeof(smallbits))
free(bits, M_TEMP);
done2:
mtx_unlock(&Giant);
return (error);
}

2
sys/kern/sys_socket.c
View file

@ -223,8 +223,10 @@ soo_poll(fp, events, active_cred, td)
struct socket *so = fp->f_data;
int error;
NET_LOCK_GIANT();
error = (so->so_proto->pr_usrreqs->pru_sopoll)
(so, events, fp->f_cred, td);
NET_UNLOCK_GIANT();
return (error);
}

3
sys/kern/vfs_vnops.c
View file

@ -850,7 +850,7 @@ vn_poll(fp, events, active_cred, td)
struct vnode *vp;
int error;
GIANT_REQUIRED;
mtx_lock(&Giant);
vp = fp->f_vnode;
#ifdef MAC
@ -861,6 +861,7 @@ vn_poll(fp, events, active_cred, td)
#endif
error = VOP_POLL(vp, events, fp->f_cred, td);
mtx_unlock(&Giant);
return (error);
}