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Added sys_close and sys_fsync

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Untested.
This commit is contained in:
Bahadir Balban
2008-05-23 03:59:18 +00:00
parent 00b47117b0
commit 6be310f460
8 changed files with 148 additions and 21 deletions
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86
tasks/mm0/src/file.c
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@@ -237,6 +237,31 @@ int vfs_write(unsigned long vnum, unsigned long file_offset,
return err;
}
int vfs_close(l4id_t sender, int fd)
{
int err;
l4_save_ipcregs();
write_mr(L4SYS_ARG0, sender);
write_mr(L4SYS_ARG1, fd);
if ((err = l4_sendrecv(VFS_TID, VFS_TID, L4_IPC_TAG_PAGER_CLOSE)) < 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 updated file stats back to vfs. (e.g. new file size) */
int vfs_update_file_stats(struct vm_file *f)
{
@@ -255,7 +280,8 @@ int vfs_update_file_stats(struct vm_file *f)
/* Check if syscall was successful */
if ((err = l4_get_retval()) < 0) {
printf("%s: Pager to VFS write error: %d.\n", __FUNCTION__, err);
printf("%s: Pager to VFS write error: %d.\n",
__FUNCTION__, err);
return err;
}
@@ -285,6 +311,7 @@ int write_file_pages(struct vm_file *f, unsigned long pfn_start,
return 0;
}
/* Flush all dirty file pages and update file stats */
int flush_file_pages(struct vm_file *f)
{
write_file_pages(f, 0, __pfn(page_align_up(f->length)));
@@ -294,38 +321,67 @@ int flush_file_pages(struct vm_file *f)
return 0;
}
int sys_close(l4id_t sender, int fd)
/* Given a task and fd syncs all IO on it */
int fsync_common(l4id_t sender, int fd)
{
struct tcb *task;
struct vm_file *f;
int retval, err;
struct tcb *task;
int err;
/* Get the task */
BUG_ON(!(task = find_task(sender)));
/* Check fd validity */
if (fd < 0 || fd > TASK_FILES_MAX || !task->fd[fd].vmfile) {
retval = -EBADF;
goto out;
}
if (fd < 0 || fd > TASK_FILES_MAX || !task->fd[fd].vmfile)
return -EBADF;
/* Finish I/O on file */
f = task->fd[fd].vmfile;
if ((err = flush_file_pages(f)) < 0) {
retval = err;
goto out;
}
if ((err = flush_file_pages(f)) < 0)
return err;
out:
l4_ipc_return(retval);
return 0;
}
int sys_fsync(int fd)
/* Closes the file descriptor and notifies vfs */
int fd_close(l4id_t sender, int fd)
{
struct tcb *task;
int err;
/* Get the task */
BUG_ON(!(task = find_task(sender)));
if ((err = vfs_close(task->tid, fd)) < 0)
return err;
task->fd[fd].vnum = 0;
task->fd[fd].cursor = 0;
task->fd[fd].vmfile = 0;
return 0;
}
int sys_close(l4id_t sender, int fd)
{
int err;
/* Sync the file and update stats */
if ((err = fsync_common(sender, fd)) < 0) {
l4_ipc_return(err);
return 0;
}
/* Close the file descriptor. */
return fd_close(sender, fd);
}
int sys_fsync(l4id_t sender, int fd)
{
/* Sync the file and update stats */
return fsync_common(sender, fd);
}
/* FIXME: Add error handling to this */
/* Extends a file's size by adding it new pages */
int new_file_pages(struct vm_file *f, unsigned long start, unsigned long end)