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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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30
tasks/mm0/src/file.c
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@@ -237,6 +237,34 @@ int vfs_write(unsigned long vnum, unsigned long file_offset,
return err;
}
/* Writes updated file stats back to vfs. (e.g. new file size) */
int vfs_update_file_stats(struct vm_file *f)
{
int err;
l4_save_ipcregs();
write_mr(L4SYS_ARG0, vm_file_to_vnum(f));
write_mr(L4SYS_ARG1, f->length);
if ((err = l4_sendrecv(VFS_TID, VFS_TID,
L4_IPC_TAG_PAGER_UPDATE_STATS)) < 0) {
printf("%s: L4 IPC Error: %d.\n", __FUNCTION__, err);
return err;
}
/* Check if syscall was successful */
if ((err = l4_get_retval()) < 0) {
printf("%s: Pager to VFS write error: %d.\n", __FUNCTION__, err);
return err;
}
l4_restore_ipcregs();
return err;
}
/* Writes pages in cache back to their file */
int write_file_pages(struct vm_file *f, unsigned long pfn_start,
unsigned long pfn_end)
@@ -261,6 +289,8 @@ int flush_file_pages(struct vm_file *f)
{
write_file_pages(f, 0, __pfn(page_align_up(f->length)));
vfs_update_file_stats(f);
return 0;
}