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Flushing pages to vfs will work, but the issue is that while vfs is

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serving mm0, if it page faults, system deadlocks because mm0 is waiting to be served by vfs.

FIX: To fix this, mm0 will need to fork itself and keep a separate thread solely for
page fault handling.
This commit is contained in:
Bahadir Balban
2008-05-28 23:37:41 +03:00
parent 98888a94b5
commit f561d885d5
6 changed files with 39 additions and 9 deletions
Download Patch File Download Diff File Expand all files Collapse all files

14
tasks/fs0/src/syscalls.c
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@@ -30,6 +30,8 @@ int pager_sys_open(l4id_t sender, int fd, unsigned long vnum, unsigned long size
{
int err;
printf("%s/%s\n", __TASKNAME__, __FUNCTION__);
l4_save_ipcregs();
write_mr(L4SYS_ARG0, sender);
@@ -104,6 +106,8 @@ int pager_sys_close(l4id_t sender, l4id_t closer, int fd)
struct tcb *task;
int err;
printf("%s/%s\n", __TASKNAME__, __FUNCTION__);
BUG_ON(!(task = find_task(closer)));
printf("Deleting fd: %d\n", fd);
@@ -132,6 +136,7 @@ int sys_open(l4id_t sender, const char *pathname, int flags, unsigned int mode)
int fd;
int retval, err;
printf("%s/%s\n", __TASKNAME__, __FUNCTION__);
/* Get the task */
BUG_ON(!(task = find_task(sender)));
@@ -337,6 +342,7 @@ int pager_sys_read(l4id_t sender, unsigned long vnum, unsigned long f_offset,
struct vnode *v;
int err, retval = 0;
printf("%s/%s\n", __TASKNAME__, __FUNCTION__);
if (sender != PAGER_TID) {
retval = -EINVAL;
goto out;
@@ -370,6 +376,7 @@ int pager_update_stats(l4id_t sender, unsigned long vnum,
struct vnode *v;
int retval = 0;
printf("%s/%s\n", __TASKNAME__, __FUNCTION__);
if (sender != PAGER_TID) {
retval = -EINVAL;
goto out;
@@ -402,6 +409,7 @@ int pager_sys_write(l4id_t sender, unsigned long vnum, unsigned long f_offset,
struct vnode *v;
int err, retval = 0;
printf("%s/%s\n", __TASKNAME__, __FUNCTION__);
if (sender != PAGER_TID) {
retval = -EINVAL;
goto out;
@@ -419,6 +427,9 @@ int pager_sys_write(l4id_t sender, unsigned long vnum, unsigned long f_offset,
goto out;
}
printf("%s/%s: Writing to vnode %lu, at pgoff 0x%x, %d pages, buf at 0x%x\n",
__TASKNAME__, __FUNCTION__, vnum, f_offset, npages, pagebuf);
/*
* If the file is extended, write silently extends it.
* But we expect an explicit pager_update_stats from the
@@ -430,7 +441,9 @@ int pager_sys_write(l4id_t sender, unsigned long vnum, unsigned long f_offset,
}
out:
printf("%s/%s: Returning ipc result.\n", __TASKNAME__, __FUNCTION__);
l4_ipc_return(retval);
printf("%s/%s: Done.\n", __TASKNAME__, __FUNCTION__);
return 0;
}
@@ -482,6 +495,7 @@ int sys_readdir(l4id_t sender, int fd, void *buf, int count)
struct dentry *d;
struct tcb *t;
printf("%s/%s\n", __TASKNAME__, __FUNCTION__);
/* Get the task */
BUG_ON(!(t = find_task(sender)));