sambuc/codezero
1
0
Fork 0
mirror of https://github.com/drasko/codezero.git synced 2026-02-07 07:23:15 +01:00
Code Issues Actions Packages Projects Releases Wiki Activity

Added syscall to update filestats (size) from pager.

Browse Source 
After flushing written/truncated pages, stats are updated
so that vfs is synced with new file info such as its size.
This commit is contained in:
Bahadir Balban
2008-05-21 10:23:11 +00:00
parent 5efece98cd
commit bd8b182f1b
6 changed files with 70 additions and 7 deletions
Download Patch File Download Diff File Expand all files Collapse all files

3
tasks/fs0/include/syscalls.h
View File

@@ -18,4 +18,7 @@ int pager_sys_read(l4id_t sender, unsigned long vnum, unsigned long f_offset,
int pager_sys_write(l4id_t sender, unsigned long vnum, unsigned long f_offset,
unsigned long npages, void *pagebuf);
int pager_update_stats(l4id_t sender, unsigned long vnum,
unsigned long newsize);
#endif /* __FS0_SYSCALLS_H__ */

5
tasks/fs0/main.c
View File

@@ -92,6 +92,11 @@ void handle_fs_requests(void)
pager_sys_write(sender, (unsigned long)mr[0], (unsigned long)mr[1],
(unsigned long)mr[2], (void *)mr[3]);
break;
case L4_IPC_TAG_PAGER_UPDATE_STATS:
pager_update_stats(sender, (unsigned long)mr[0],
(unsigned long)mr[1]);
break;
default:
printf("%s: Unrecognised ipc tag (%d) "
"received from tid: %d. Ignoring.\n", __TASKNAME__,

37
tasks/fs0/src/syscalls.c
View File

@@ -259,6 +259,31 @@ out:
return 0;
}
int pager_update_stats(l4id_t sender, unsigned long vnum,
unsigned long newsize)
{
struct vnode *v;
int retval = 0;
if (sender != PAGER_TID) {
retval = -EINVAL;
goto out;
}
/* Lookup vnode */
if (!(v = vfs_lookup_byvnum(vfs_root.pivot->sb, vnum))) {
retval = -EINVAL; /* No such vnode */
goto out;
}
v->size = newsize;
v->sb->ops->write_vnode(v->sb, v);
out:
l4_ipc_return(retval);
return 0;
}
/*
* This can be solely called by the pager and is not the posix write call.
* That call is in the pager. This writes the dirty pages of a file
@@ -271,7 +296,6 @@ int pager_sys_write(l4id_t sender, unsigned long vnum, unsigned long f_offset,
{
struct vnode *v;
int err, retval = 0;
int bytes = 0;
if (sender != PAGER_TID) {
retval = -EINVAL;
@@ -290,17 +314,16 @@ int pager_sys_write(l4id_t sender, unsigned long vnum, unsigned long f_offset,
goto out;
}
/* If the file is extended, write automatically extends it */
/*
* If the file is extended, write silently extends it.
* But we expect an explicit pager_update_stats from the
* pager to update the new file size on the vnode.
*/
if ((err = v->fops.write(v, f_offset, npages, pagebuf)) < 0) {
retval = err;
goto out;
}
/* FIXME: Find a way to properly update new bytes */
BUG();
v->size += bytes;
v->sb->ops->write_vnode(v->sb, v);
out:
l4_ipc_return(retval);
return 0;