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Commit 6a6d27de authored by Al Viro's avatar Al Viro
Browse files

take close-on-exec logics to fs/file.c, clean it up a bit 



... and add cond_resched() there, while we are at it.  We can
get large latencies as is...

Signed-off-by: default avatarAl Viro <viro@zeniv.linux.org.uk>
parent 723a1d77

fs/exec.c

+6 −35
Original line number Diff line number Diff line
@@ -1006,40 +1006,6 @@ static int de_thread(struct task_struct *tsk) 
	return 0;

}



/*

 * These functions flushes out all traces of the currently running executable

 * so that a new one can be started

 */

static void flush_old_files(struct files_struct * files)

{

	long j = -1;

	struct fdtable *fdt;



	spin_lock(&files->file_lock);

	for (;;) {

		unsigned long set, i;



		j++;

		i = j * BITS_PER_LONG;

		fdt = files_fdtable(files);

		if (i >= fdt->max_fds)

			break;

		set = fdt->close_on_exec[j];

		if (!set)

			continue;

		fdt->close_on_exec[j] = 0;

		spin_unlock(&files->file_lock);

		for ( ; set ; i++,set >>= 1) {

			if (set & 1) {

				sys_close(i);

			}

		}

		spin_lock(&files->file_lock);



	}

	spin_unlock(&files->file_lock);

}



char *get_task_comm(char *buf, struct task_struct *tsk)

{

	/* buf must be at least sizeof(tsk->comm) in size */
@@ -1050,6 +1016,11 @@ char *get_task_comm(char *buf, struct task_struct *tsk) 
}

EXPORT_SYMBOL_GPL(get_task_comm);



/*

 * These functions flushes out all traces of the currently running executable

 * so that a new one can be started

 */



void set_task_comm(struct task_struct *tsk, char *buf)

{

	task_lock(tsk);
@@ -1171,7 +1142,7 @@ void setup_new_exec(struct linux_binprm * bprm) 
	current->self_exec_id++;

			

	flush_signal_handlers(current, 0);

	flush_old_files(current->files);

	do_close_on_exec(current->files);

}

EXPORT_SYMBOL(setup_new_exec);

fs/file.c

+37 −0
Original line number Diff line number Diff line
@@ -652,6 +652,43 @@ int __close_fd(struct files_struct *files, unsigned fd) 
	return -EBADF;

}



void do_close_on_exec(struct files_struct *files)

{

	unsigned i;

	struct fdtable *fdt;



	/* exec unshares first */

	BUG_ON(atomic_read(&files->count) != 1);

	spin_lock(&files->file_lock);

	for (i = 0; ; i++) {

		unsigned long set;

		unsigned fd = i * BITS_PER_LONG;

		fdt = files_fdtable(files);

		if (fd >= fdt->max_fds)

			break;

		set = fdt->close_on_exec[i];

		if (!set)

			continue;

		fdt->close_on_exec[i] = 0;

		for ( ; set ; fd++, set >>= 1) {

			struct file *file;

			if (!(set & 1))

				continue;

			file = fdt->fd[fd];

			if (!file)

				continue;

			rcu_assign_pointer(fdt->fd[fd], NULL);

			__put_unused_fd(files, fd);

			spin_unlock(&files->file_lock);

			filp_close(file, files);

			cond_resched();

			spin_lock(&files->file_lock);

		}



	}

	spin_unlock(&files->file_lock);

}



struct file *fget(unsigned int fd)

{

	struct file *file;

include/linux/fdtable.h

+1 −0
Original line number Diff line number Diff line
@@ -118,6 +118,7 @@ void put_files_struct(struct files_struct *fs); 
void reset_files_struct(struct files_struct *);

int unshare_files(struct files_struct **);

struct files_struct *dup_fd(struct files_struct *, int *);

void do_close_on_exec(struct files_struct *);



extern int __alloc_fd(struct files_struct *files,

		      unsigned start, unsigned end, unsigned flags);