Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 601 insertions, 0 deletions

diff --git a/fs/fcntl.c b/fs/fcntl.c
new file mode 100644
index 000000000000..c1708066bf55
--- /dev/null
+++ b/fs/fcntl.c
@@ -0,0 +1,601 @@
+/*
+ *  linux/fs/fcntl.c
+ *
+ *  Copyright (C) 1991, 1992  Linus Torvalds
+ */
+
+#include <linux/syscalls.h>
+#include <linux/init.h>
+#include <linux/mm.h>
+#include <linux/fs.h>
+#include <linux/file.h>
+#include <linux/dnotify.h>
+#include <linux/smp_lock.h>
+#include <linux/slab.h>
+#include <linux/module.h>
+#include <linux/security.h>
+#include <linux/ptrace.h>
+
+#include <asm/poll.h>
+#include <asm/siginfo.h>
+#include <asm/uaccess.h>
+
+void fastcall set_close_on_exec(unsigned int fd, int flag)
+{
+	struct files_struct *files = current->files;
+	spin_lock(&files->file_lock);
+	if (flag)
+		FD_SET(fd, files->close_on_exec);
+	else
+		FD_CLR(fd, files->close_on_exec);
+	spin_unlock(&files->file_lock);
+}
+
+static inline int get_close_on_exec(unsigned int fd)
+{
+	struct files_struct *files = current->files;
+	int res;
+	spin_lock(&files->file_lock);
+	res = FD_ISSET(fd, files->close_on_exec);
+	spin_unlock(&files->file_lock);
+	return res;
+}
+
+/*
+ * locate_fd finds a free file descriptor in the open_fds fdset,
+ * expanding the fd arrays if necessary.  Must be called with the
+ * file_lock held for write.
+ */
+
+static int locate_fd(struct files_struct *files, 
+			    struct file *file, unsigned int orig_start)
+{
+	unsigned int newfd;
+	unsigned int start;
+	int error;
+
+	error = -EINVAL;
+	if (orig_start >= current->signal->rlim[RLIMIT_NOFILE].rlim_cur)
+		goto out;
+
+repeat:
+	/*
+	 * Someone might have closed fd's in the range
+	 * orig_start..files->next_fd
+	 */
+	start = orig_start;
+	if (start < files->next_fd)
+		start = files->next_fd;
+
+	newfd = start;
+	if (start < files->max_fdset) {
+		newfd = find_next_zero_bit(files->open_fds->fds_bits,
+			files->max_fdset, start);
+	}
+	
+	error = -EMFILE;
+	if (newfd >= current->signal->rlim[RLIMIT_NOFILE].rlim_cur)
+		goto out;
+
+	error = expand_files(files, newfd);
+	if (error < 0)
+		goto out;
+
+	/*
+	 * If we needed to expand the fs array we
+	 * might have blocked - try again.
+	 */
+	if (error)
+		goto repeat;
+
+	if (start <= files->next_fd)
+		files->next_fd = newfd + 1;
+	
+	error = newfd;
+	
+out:
+	return error;
+}
+
+static int dupfd(struct file *file, unsigned int start)
+{
+	struct files_struct * files = current->files;
+	int fd;
+
+	spin_lock(&files->file_lock);
+	fd = locate_fd(files, file, start);
+	if (fd >= 0) {
+		FD_SET(fd, files->open_fds);
+		FD_CLR(fd, files->close_on_exec);
+		spin_unlock(&files->file_lock);
+		fd_install(fd, file);
+	} else {
+		spin_unlock(&files->file_lock);
+		fput(file);
+	}
+
+	return fd;
+}
+
+asmlinkage long sys_dup2(unsigned int oldfd, unsigned int newfd)
+{
+	int err = -EBADF;
+	struct file * file, *tofree;
+	struct files_struct * files = current->files;
+
+	spin_lock(&files->file_lock);
+	if (!(file = fcheck(oldfd)))
+		goto out_unlock;
+	err = newfd;
+	if (newfd == oldfd)
+		goto out_unlock;
+	err = -EBADF;
+	if (newfd >= current->signal->rlim[RLIMIT_NOFILE].rlim_cur)
+		goto out_unlock;
+	get_file(file);			/* We are now finished with oldfd */
+
+	err = expand_files(files, newfd);
+	if (err < 0)
+		goto out_fput;
+
+	/* To avoid races with open() and dup(), we will mark the fd as
+	 * in-use in the open-file bitmap throughout the entire dup2()
+	 * process.  This is quite safe: do_close() uses the fd array
+	 * entry, not the bitmap, to decide what work needs to be
+	 * done.  --sct */
+	/* Doesn't work. open() might be there first. --AV */
+
+	/* Yes. It's a race. In user space. Nothing sane to do */
+	err = -EBUSY;
+	tofree = files->fd[newfd];
+	if (!tofree && FD_ISSET(newfd, files->open_fds))
+		goto out_fput;
+
+	files->fd[newfd] = file;
+	FD_SET(newfd, files->open_fds);
+	FD_CLR(newfd, files->close_on_exec);
+	spin_unlock(&files->file_lock);
+
+	if (tofree)
+		filp_close(tofree, files);
+	err = newfd;
+out:
+	return err;
+out_unlock:
+	spin_unlock(&files->file_lock);
+	goto out;
+
+out_fput:
+	spin_unlock(&files->file_lock);
+	fput(file);
+	goto out;
+}
+
+asmlinkage long sys_dup(unsigned int fildes)
+{
+	int ret = -EBADF;
+	struct file * file = fget(fildes);
+
+	if (file)
+		ret = dupfd(file, 0);
+	return ret;
+}
+
+#define SETFL_MASK (O_APPEND | O_NONBLOCK | O_NDELAY | FASYNC | O_DIRECT | O_NOATIME)
+
+static int setfl(int fd, struct file * filp, unsigned long arg)
+{
+	struct inode * inode = filp->f_dentry->d_inode;
+	int error = 0;
+
+	/* O_APPEND cannot be cleared if the file is marked as append-only */
+	if (!(arg & O_APPEND) && IS_APPEND(inode))
+		return -EPERM;
+
+	/* O_NOATIME can only be set by the owner or superuser */
+	if ((arg & O_NOATIME) && !(filp->f_flags & O_NOATIME))
+		if (current->fsuid != inode->i_uid && !capable(CAP_FOWNER))
+			return -EPERM;
+
+	/* required for strict SunOS emulation */
+	if (O_NONBLOCK != O_NDELAY)
+	       if (arg & O_NDELAY)
+		   arg |= O_NONBLOCK;
+
+	if (arg & O_DIRECT) {
+		if (!filp->f_mapping || !filp->f_mapping->a_ops ||
+			!filp->f_mapping->a_ops->direct_IO)
+				return -EINVAL;
+	}
+
+	if (filp->f_op && filp->f_op->check_flags)
+		error = filp->f_op->check_flags(arg);
+	if (error)
+		return error;
+
+	lock_kernel();
+	if ((arg ^ filp->f_flags) & FASYNC) {
+		if (filp->f_op && filp->f_op->fasync) {
+			error = filp->f_op->fasync(fd, filp, (arg & FASYNC) != 0);
+			if (error < 0)
+				goto out;
+		}
+	}
+
+	filp->f_flags = (arg & SETFL_MASK) | (filp->f_flags & ~SETFL_MASK);
+ out:
+	unlock_kernel();
+	return error;
+}
+
+static void f_modown(struct file *filp, unsigned long pid,
+                     uid_t uid, uid_t euid, int force)
+{
+	write_lock_irq(&filp->f_owner.lock);
+	if (force || !filp->f_owner.pid) {
+		filp->f_owner.pid = pid;
+		filp->f_owner.uid = uid;
+		filp->f_owner.euid = euid;
+	}
+	write_unlock_irq(&filp->f_owner.lock);
+}
+
+int f_setown(struct file *filp, unsigned long arg, int force)
+{
+	int err;
+	
+	err = security_file_set_fowner(filp);
+	if (err)
+		return err;
+
+	f_modown(filp, arg, current->uid, current->euid, force);
+	return 0;
+}
+
+EXPORT_SYMBOL(f_setown);
+
+void f_delown(struct file *filp)
+{
+	f_modown(filp, 0, 0, 0, 1);
+}
+
+static long do_fcntl(int fd, unsigned int cmd, unsigned long arg,
+		struct file *filp)
+{
+	long err = -EINVAL;
+
+	switch (cmd) {
+	case F_DUPFD:
+		get_file(filp);
+		err = dupfd(filp, arg);
+		break;
+	case F_GETFD:
+		err = get_close_on_exec(fd) ? FD_CLOEXEC : 0;
+		break;
+	case F_SETFD:
+		err = 0;
+		set_close_on_exec(fd, arg & FD_CLOEXEC);
+		break;
+	case F_GETFL:
+		err = filp->f_flags;
+		break;
+	case F_SETFL:
+		err = setfl(fd, filp, arg);
+		break;
+	case F_GETLK:
+		err = fcntl_getlk(filp, (struct flock __user *) arg);
+		break;
+	case F_SETLK:
+	case F_SETLKW:
+		err = fcntl_setlk(filp, cmd, (struct flock __user *) arg);
+		break;
+	case F_GETOWN:
+		/*
+		 * XXX If f_owner is a process group, the
+		 * negative return value will get converted
+		 * into an error.  Oops.  If we keep the
+		 * current syscall conventions, the only way
+		 * to fix this will be in libc.
+		 */
+		err = filp->f_owner.pid;
+		force_successful_syscall_return();
+		break;
+	case F_SETOWN:
+		err = f_setown(filp, arg, 1);
+		break;
+	case F_GETSIG:
+		err = filp->f_owner.signum;
+		break;
+	case F_SETSIG:
+		/* arg == 0 restores default behaviour. */
+		if (arg < 0 || arg > _NSIG) {
+			break;
+		}
+		err = 0;
+		filp->f_owner.signum = arg;
+		break;
+	case F_GETLEASE:
+		err = fcntl_getlease(filp);
+		break;
+	case F_SETLEASE:
+		err = fcntl_setlease(fd, filp, arg);
+		break;
+	case F_NOTIFY:
+		err = fcntl_dirnotify(fd, filp, arg);
+		break;
+	default:
+		break;
+	}
+	return err;
+}
+
+asmlinkage long sys_fcntl(unsigned int fd, unsigned int cmd, unsigned long arg)
+{	
+	struct file *filp;
+	long err = -EBADF;
+
+	filp = fget(fd);
+	if (!filp)
+		goto out;
+
+	err = security_file_fcntl(filp, cmd, arg);
+	if (err) {
+		fput(filp);
+		return err;
+	}
+
+	err = do_fcntl(fd, cmd, arg, filp);
+
+ 	fput(filp);
+out:
+	return err;
+}
+
+#if BITS_PER_LONG == 32
+asmlinkage long sys_fcntl64(unsigned int fd, unsigned int cmd, unsigned long arg)
+{	
+	struct file * filp;
+	long err;
+
+	err = -EBADF;
+	filp = fget(fd);
+	if (!filp)
+		goto out;
+
+	err = security_file_fcntl(filp, cmd, arg);
+	if (err) {
+		fput(filp);
+		return err;
+	}
+	err = -EBADF;
+	
+	switch (cmd) {
+		case F_GETLK64:
+			err = fcntl_getlk64(filp, (struct flock64 __user *) arg);
+			break;
+		case F_SETLK64:
+		case F_SETLKW64:
+			err = fcntl_setlk64(filp, cmd, (struct flock64 __user *) arg);
+			break;
+		default:
+			err = do_fcntl(fd, cmd, arg, filp);
+			break;
+	}
+	fput(filp);
+out:
+	return err;
+}
+#endif
+
+/* Table to convert sigio signal codes into poll band bitmaps */
+
+static long band_table[NSIGPOLL] = {
+	POLLIN | POLLRDNORM,			/* POLL_IN */
+	POLLOUT | POLLWRNORM | POLLWRBAND,	/* POLL_OUT */
+	POLLIN | POLLRDNORM | POLLMSG,		/* POLL_MSG */
+	POLLERR,				/* POLL_ERR */
+	POLLPRI | POLLRDBAND,			/* POLL_PRI */
+	POLLHUP | POLLERR			/* POLL_HUP */
+};
+
+static inline int sigio_perm(struct task_struct *p,
+                             struct fown_struct *fown, int sig)
+{
+	return (((fown->euid == 0) ||
+		 (fown->euid == p->suid) || (fown->euid == p->uid) ||
+		 (fown->uid == p->suid) || (fown->uid == p->uid)) &&
+		!security_file_send_sigiotask(p, fown, sig));
+}
+
+static void send_sigio_to_task(struct task_struct *p,
+			       struct fown_struct *fown, 
+			       int fd,
+			       int reason)
+{
+	if (!sigio_perm(p, fown, fown->signum))
+		return;
+
+	switch (fown->signum) {
+		siginfo_t si;
+		default:
+			/* Queue a rt signal with the appropriate fd as its
+			   value.  We use SI_SIGIO as the source, not 
+			   SI_KERNEL, since kernel signals always get 
+			   delivered even if we can't queue.  Failure to
+			   queue in this case _should_ be reported; we fall
+			   back to SIGIO in that case. --sct */
+			si.si_signo = fown->signum;
+			si.si_errno = 0;
+		        si.si_code  = reason;
+			/* Make sure we are called with one of the POLL_*
+			   reasons, otherwise we could leak kernel stack into
+			   userspace.  */
+			if ((reason & __SI_MASK) != __SI_POLL)
+				BUG();
+			if (reason - POLL_IN >= NSIGPOLL)
+				si.si_band  = ~0L;
+			else
+				si.si_band = band_table[reason - POLL_IN];
+			si.si_fd    = fd;
+			if (!send_sig_info(fown->signum, &si, p))
+				break;
+		/* fall-through: fall back on the old plain SIGIO signal */
+		case 0:
+			send_group_sig_info(SIGIO, SEND_SIG_PRIV, p);
+	}
+}
+
+void send_sigio(struct fown_struct *fown, int fd, int band)
+{
+	struct task_struct *p;
+	int pid;
+	
+	read_lock(&fown->lock);
+	pid = fown->pid;
+	if (!pid)
+		goto out_unlock_fown;
+	
+	read_lock(&tasklist_lock);
+	if (pid > 0) {
+		p = find_task_by_pid(pid);
+		if (p) {
+			send_sigio_to_task(p, fown, fd, band);
+		}
+	} else {
+		do_each_task_pid(-pid, PIDTYPE_PGID, p) {
+			send_sigio_to_task(p, fown, fd, band);
+		} while_each_task_pid(-pid, PIDTYPE_PGID, p);
+	}
+	read_unlock(&tasklist_lock);
+ out_unlock_fown:
+	read_unlock(&fown->lock);
+}
+
+static void send_sigurg_to_task(struct task_struct *p,
+                                struct fown_struct *fown)
+{
+	if (sigio_perm(p, fown, SIGURG))
+		send_group_sig_info(SIGURG, SEND_SIG_PRIV, p);
+}
+
+int send_sigurg(struct fown_struct *fown)
+{
+	struct task_struct *p;
+	int pid, ret = 0;
+	
+	read_lock(&fown->lock);
+	pid = fown->pid;
+	if (!pid)
+		goto out_unlock_fown;
+
+	ret = 1;
+	
+	read_lock(&tasklist_lock);
+	if (pid > 0) {
+		p = find_task_by_pid(pid);
+		if (p) {
+			send_sigurg_to_task(p, fown);
+		}
+	} else {
+		do_each_task_pid(-pid, PIDTYPE_PGID, p) {
+			send_sigurg_to_task(p, fown);
+		} while_each_task_pid(-pid, PIDTYPE_PGID, p);
+	}
+	read_unlock(&tasklist_lock);
+ out_unlock_fown:
+	read_unlock(&fown->lock);
+	return ret;
+}
+
+static DEFINE_RWLOCK(fasync_lock);
+static kmem_cache_t *fasync_cache;
+
+/*
+ * fasync_helper() is used by some character device drivers (mainly mice)
+ * to set up the fasync queue. It returns negative on error, 0 if it did
+ * no changes and positive if it added/deleted the entry.
+ */
+int fasync_helper(int fd, struct file * filp, int on, struct fasync_struct **fapp)
+{
+	struct fasync_struct *fa, **fp;
+	struct fasync_struct *new = NULL;
+	int result = 0;
+
+	if (on) {
+		new = kmem_cache_alloc(fasync_cache, SLAB_KERNEL);
+		if (!new)
+			return -ENOMEM;
+	}
+	write_lock_irq(&fasync_lock);
+	for (fp = fapp; (fa = *fp) != NULL; fp = &fa->fa_next) {
+		if (fa->fa_file == filp) {
+			if(on) {
+				fa->fa_fd = fd;
+				kmem_cache_free(fasync_cache, new);
+			} else {
+				*fp = fa->fa_next;
+				kmem_cache_free(fasync_cache, fa);
+				result = 1;
+			}
+			goto out;
+		}
+	}
+
+	if (on) {
+		new->magic = FASYNC_MAGIC;
+		new->fa_file = filp;
+		new->fa_fd = fd;
+		new->fa_next = *fapp;
+		*fapp = new;
+		result = 1;
+	}
+out:
+	write_unlock_irq(&fasync_lock);
+	return result;
+}
+
+EXPORT_SYMBOL(fasync_helper);
+
+void __kill_fasync(struct fasync_struct *fa, int sig, int band)
+{
+	while (fa) {
+		struct fown_struct * fown;
+		if (fa->magic != FASYNC_MAGIC) {
+			printk(KERN_ERR "kill_fasync: bad magic number in "
+			       "fasync_struct!\n");
+			return;
+		}
+		fown = &fa->fa_file->f_owner;
+		/* Don't send SIGURG to processes which have not set a
+		   queued signum: SIGURG has its own default signalling
+		   mechanism. */
+		if (!(sig == SIGURG && fown->signum == 0))
+			send_sigio(fown, fa->fa_fd, band);
+		fa = fa->fa_next;
+	}
+}
+
+EXPORT_SYMBOL(__kill_fasync);
+
+void kill_fasync(struct fasync_struct **fp, int sig, int band)
+{
+	/* First a quick test without locking: usually
+	 * the list is empty.
+	 */
+	if (*fp) {
+		read_lock(&fasync_lock);
+		/* reread *fp after obtaining the lock */
+		__kill_fasync(*fp, sig, band);
+		read_unlock(&fasync_lock);
+	}
+}
+EXPORT_SYMBOL(kill_fasync);
+
+static int __init fasync_init(void)
+{
+	fasync_cache = kmem_cache_create("fasync_cache",
+		sizeof(struct fasync_struct), 0, SLAB_PANIC, NULL, NULL);
+	return 0;
+}
+
+module_init(fasync_init)