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Added syscall to update filestats (size) from pager.

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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
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37
tasks/fs0/src/syscalls.c
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@@ -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;