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Lock accesses to the page queues by sendfile() and friends.

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This commit is contained in:
Alan Cox 2002-07-13 03:10:55 +00:00
parent 93bc4879e6
commit ae0ffa73cc
1 changed files with 8 additions and 0 deletions
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8
sys/kern/uipc_syscalls.c
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@ -1605,6 +1605,7 @@ sf_buf_free(void *addr, void *args)
sf = dtosf(addr);
pmap_qremove((vm_offset_t)addr, 1);
m = sf->m;
vm_page_lock_queues();
vm_page_unwire(m, 0);
/*
* Check for the object going away on us. This can
@ -1613,6 +1614,7 @@ sf_buf_free(void *addr, void *args)
*/
if (m->wire_count == 0 && m->object == NULL)
vm_page_free(m);
vm_page_unlock_queues();
sf->m = NULL;
mtx_lock(&sf_freelist.sf_lock);
SLIST_INSERT_HEAD(&sf_freelist.sf_head, sf, free_list);
@ -1795,7 +1797,9 @@ retry_lookup:
* us.
*/
vm_page_lock_queues();
vm_page_wire(pg);
vm_page_unlock_queues();
/*
* If page is not valid for what we need, initiate I/O
@ -1823,6 +1827,7 @@ retry_lookup:
vm_page_flag_clear(pg, PG_ZERO);
vm_page_io_finish(pg);
if (error) {
vm_page_lock_queues();
vm_page_unwire(pg, 0);
/*
* See if anyone else might know about this page.
@ -1834,6 +1839,7 @@ retry_lookup:
vm_page_busy(pg);
vm_page_free(pg);
}
vm_page_unlock_queues();
sbunlock(&so->so_snd);
goto done;
}
@ -1845,9 +1851,11 @@ retry_lookup:
* but this wait can be interrupted.
*/
if ((sf = sf_buf_alloc()) == NULL) {
vm_page_lock_queues();
vm_page_unwire(pg, 0);
if (pg->wire_count == 0 && pg->object == NULL)
vm_page_free(pg);
vm_page_unlock_queues();
sbunlock(&so->so_snd);
error = EINTR;
goto done;