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incomplete changes for sys_write/sys_close

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This commit is contained in:
Bahadir Balban
2008-02-20 22:47:22 +00:00
parent f078116901
commit 2a5cdf80b5
4 changed files with 51 additions and 7 deletions
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29
tasks/mm0/src/file.c
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@@ -145,8 +145,8 @@ struct page *find_page(struct vm_file *f, unsigned long pfn)
}
/*
* This reads-in a range of pages from a file just like a page fault,
* but its not in the page fault path.
* This reads-in a range of pages from a file and populates the page cache
* just like a page fault, but its not in the page fault path.
*/
int read_file_pages(struct vm_file *vmfile, unsigned long pfn_start,
unsigned long pfn_end)
@@ -192,8 +192,8 @@ int sys_read(l4id_t sender, int fd, void *buf, int count)
{
unsigned long foff_pfn_start, foff_pfn_end;
struct vm_file *vmfile;
struct tcb *t;
unsigned long cursor;
struct tcb *t;
int err;
BUG_ON(!(t = find_task(sender)));
@@ -215,9 +215,8 @@ int sys_read(l4id_t sender, int fd, void *buf, int count)
* FIXME: If vmfiles are mapped contiguously on mm0, then these reads
* can be implemented as a straightforward copy as below.
*
* The problem is that in-memrory file pages are usually non-contiguous.
* The problem is that in-memory file pages are usually non-contiguous.
* memcpy(buf, (void *)(vmfile->base + cursor), count);
*
*/
return 0;
@@ -225,6 +224,26 @@ int sys_read(l4id_t sender, int fd, void *buf, int count)
int sys_write(l4id_t sender, int fd, void *buf, int count)
{
unsigned long foff_pfn_start, foff_pfn_end;
struct vm_file *vmfile;
unsigned long cursor;
struct tcb *t;
int err;
BUG_ON(!(t = find_task(sender)));
/* TODO: Check user buffer and count validity */
if (fd < 0 || fd > TASK_OFILES_MAX)
return -EINVAL;
vmfile = t->fd[fd].vmfile;
cursor = t->fd[fd].cursor;
foff_pfn_start = __pfn(cursor);
foff_pfn_end = __pfn(page_align_up(cursor + count));
if ((err = write_file_pages(vmfile, foff_pfn_start, foff_pfn_end) < 0))
return err;
return 0;
}