Initial import of modified Linux 2.6.28 tree

Original upstream URL:
git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable.git | branch linux-2.6.28.y

1 files changed, 475 insertions, 0 deletions

diff --git a/fs/stat.c b/fs/stat.c
new file mode 100644
index 0000000..4bd85da
--- /dev/null
+++ b/fs/stat.c
@@ -0,0 +1,475 @@
+/*
+ *  linux/fs/stat.c
+ *
+ *  Copyright (C) 1991, 1992  Linus Torvalds
+ */
+
+#include <linux/module.h>
+#include <linux/mm.h>
+#include <linux/errno.h>
+#include <linux/file.h>
+#include <linux/highuid.h>
+#include <linux/fs.h>
+#include <linux/namei.h>
+#include <linux/security.h>
+#include <linux/syscalls.h>
+#include <linux/pagemap.h>
+
+#include <asm/uaccess.h>
+#include <asm/unistd.h>
+
+void generic_fillattr(struct inode *inode, struct kstat *stat)
+{
+	stat->dev = inode->i_sb->s_dev;
+	stat->ino = inode->i_ino;
+	stat->mode = inode->i_mode;
+	stat->nlink = inode->i_nlink;
+	stat->uid = inode->i_uid;
+	stat->gid = inode->i_gid;
+	stat->rdev = inode->i_rdev;
+	stat->atime = inode->i_atime;
+	stat->mtime = inode->i_mtime;
+	stat->ctime = inode->i_ctime;
+	stat->size = i_size_read(inode);
+	stat->blocks = inode->i_blocks;
+	stat->blksize = (1 << inode->i_blkbits);
+}
+
+EXPORT_SYMBOL(generic_fillattr);
+
+int vfs_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat)
+{
+	struct inode *inode = dentry->d_inode;
+	int retval;
+
+	retval = security_inode_getattr(mnt, dentry);
+	if (retval)
+		return retval;
+
+	if (inode->i_op->getattr)
+		return inode->i_op->getattr(mnt, dentry, stat);
+
+	generic_fillattr(inode, stat);
+	return 0;
+}
+
+EXPORT_SYMBOL(vfs_getattr);
+
+int vfs_stat_fd(int dfd, char __user *name, struct kstat *stat)
+{
+	struct path path;
+	int error;
+
+	error = user_path_at(dfd, name, LOOKUP_FOLLOW, &path);
+	if (!error) {
+		error = vfs_getattr(path.mnt, path.dentry, stat);
+		path_put(&path);
+	}
+	return error;
+}
+
+int vfs_stat(char __user *name, struct kstat *stat)
+{
+	return vfs_stat_fd(AT_FDCWD, name, stat);
+}
+
+EXPORT_SYMBOL(vfs_stat);
+
+int vfs_lstat_fd(int dfd, char __user *name, struct kstat *stat)
+{
+	struct path path;
+	int error;
+
+	error = user_path_at(dfd, name, 0, &path);
+	if (!error) {
+		error = vfs_getattr(path.mnt, path.dentry, stat);
+		path_put(&path);
+	}
+	return error;
+}
+
+int vfs_lstat(char __user *name, struct kstat *stat)
+{
+	return vfs_lstat_fd(AT_FDCWD, name, stat);
+}
+
+EXPORT_SYMBOL(vfs_lstat);
+
+int vfs_fstat(unsigned int fd, struct kstat *stat)
+{
+	struct file *f = fget(fd);
+	int error = -EBADF;
+
+	if (f) {
+		error = vfs_getattr(f->f_path.mnt, f->f_path.dentry, stat);
+		fput(f);
+	}
+	return error;
+}
+
+EXPORT_SYMBOL(vfs_fstat);
+
+#ifdef __ARCH_WANT_OLD_STAT
+
+/*
+ * For backward compatibility?  Maybe this should be moved
+ * into arch/i386 instead?
+ */
+static int cp_old_stat(struct kstat *stat, struct __old_kernel_stat __user * statbuf)
+{
+	static int warncount = 5;
+	struct __old_kernel_stat tmp;
+	
+	if (warncount > 0) {
+		warncount--;
+		printk(KERN_WARNING "VFS: Warning: %s using old stat() call. Recompile your binary.\n",
+			current->comm);
+	} else if (warncount < 0) {
+		/* it's laughable, but... */
+		warncount = 0;
+	}
+
+	memset(&tmp, 0, sizeof(struct __old_kernel_stat));
+	tmp.st_dev = old_encode_dev(stat->dev);
+	tmp.st_ino = stat->ino;
+	if (sizeof(tmp.st_ino) < sizeof(stat->ino) && tmp.st_ino != stat->ino)
+		return -EOVERFLOW;
+	tmp.st_mode = stat->mode;
+	tmp.st_nlink = stat->nlink;
+	if (tmp.st_nlink != stat->nlink)
+		return -EOVERFLOW;
+	SET_UID(tmp.st_uid, stat->uid);
+	SET_GID(tmp.st_gid, stat->gid);
+	tmp.st_rdev = old_encode_dev(stat->rdev);
+#if BITS_PER_LONG == 32
+	if (stat->size > MAX_NON_LFS)
+		return -EOVERFLOW;
+#endif	
+	tmp.st_size = stat->size;
+	tmp.st_atime = stat->atime.tv_sec;
+	tmp.st_mtime = stat->mtime.tv_sec;
+	tmp.st_ctime = stat->ctime.tv_sec;
+	return copy_to_user(statbuf,&tmp,sizeof(tmp)) ? -EFAULT : 0;
+}
+
+SYSCALL_DEFINE2(stat, char __user *, filename, struct __old_kernel_stat __user *, statbuf)
+{
+	struct kstat stat;
+	int error = vfs_stat_fd(AT_FDCWD, filename, &stat);
+
+	if (!error)
+		error = cp_old_stat(&stat, statbuf);
+
+	return error;
+}
+
+SYSCALL_DEFINE2(lstat, char __user *, filename, struct __old_kernel_stat __user *, statbuf)
+{
+	struct kstat stat;
+	int error = vfs_lstat_fd(AT_FDCWD, filename, &stat);
+
+	if (!error)
+		error = cp_old_stat(&stat, statbuf);
+
+	return error;
+}
+
+SYSCALL_DEFINE2(fstat, unsigned int, fd, struct __old_kernel_stat __user *, statbuf)
+{
+	struct kstat stat;
+	int error = vfs_fstat(fd, &stat);
+
+	if (!error)
+		error = cp_old_stat(&stat, statbuf);
+
+	return error;
+}
+
+#endif /* __ARCH_WANT_OLD_STAT */
+
+static int cp_new_stat(struct kstat *stat, struct stat __user *statbuf)
+{
+	struct stat tmp;
+
+#if BITS_PER_LONG == 32
+	if (!old_valid_dev(stat->dev) || !old_valid_dev(stat->rdev))
+		return -EOVERFLOW;
+#else
+	if (!new_valid_dev(stat->dev) || !new_valid_dev(stat->rdev))
+		return -EOVERFLOW;
+#endif
+
+	memset(&tmp, 0, sizeof(tmp));
+#if BITS_PER_LONG == 32
+	tmp.st_dev = old_encode_dev(stat->dev);
+#else
+	tmp.st_dev = new_encode_dev(stat->dev);
+#endif
+	tmp.st_ino = stat->ino;
+	if (sizeof(tmp.st_ino) < sizeof(stat->ino) && tmp.st_ino != stat->ino)
+		return -EOVERFLOW;
+	tmp.st_mode = stat->mode;
+	tmp.st_nlink = stat->nlink;
+	if (tmp.st_nlink != stat->nlink)
+		return -EOVERFLOW;
+	SET_UID(tmp.st_uid, stat->uid);
+	SET_GID(tmp.st_gid, stat->gid);
+#if BITS_PER_LONG == 32
+	tmp.st_rdev = old_encode_dev(stat->rdev);
+#else
+	tmp.st_rdev = new_encode_dev(stat->rdev);
+#endif
+#if BITS_PER_LONG == 32
+	if (stat->size > MAX_NON_LFS)
+		return -EOVERFLOW;
+#endif	
+	tmp.st_size = stat->size;
+	tmp.st_atime = stat->atime.tv_sec;
+	tmp.st_mtime = stat->mtime.tv_sec;
+	tmp.st_ctime = stat->ctime.tv_sec;
+#ifdef STAT_HAVE_NSEC
+	tmp.st_atime_nsec = stat->atime.tv_nsec;
+	tmp.st_mtime_nsec = stat->mtime.tv_nsec;
+	tmp.st_ctime_nsec = stat->ctime.tv_nsec;
+#endif
+	tmp.st_blocks = stat->blocks;
+	tmp.st_blksize = stat->blksize;
+	return copy_to_user(statbuf,&tmp,sizeof(tmp)) ? -EFAULT : 0;
+}
+
+SYSCALL_DEFINE2(newstat, char __user *, filename, struct stat __user *, statbuf)
+{
+	struct kstat stat;
+	int error = vfs_stat_fd(AT_FDCWD, filename, &stat);
+
+	if (!error)
+		error = cp_new_stat(&stat, statbuf);
+
+	return error;
+}
+
+SYSCALL_DEFINE2(newlstat, char __user *, filename, struct stat __user *, statbuf)
+{
+	struct kstat stat;
+	int error = vfs_lstat_fd(AT_FDCWD, filename, &stat);
+
+	if (!error)
+		error = cp_new_stat(&stat, statbuf);
+
+	return error;
+}
+
+#if !defined(__ARCH_WANT_STAT64) || defined(__ARCH_WANT_SYS_NEWFSTATAT)
+SYSCALL_DEFINE4(newfstatat, int, dfd, char __user *, filename,
+		struct stat __user *, statbuf, int, flag)
+{
+	struct kstat stat;
+	int error = -EINVAL;
+
+	if ((flag & ~AT_SYMLINK_NOFOLLOW) != 0)
+		goto out;
+
+	if (flag & AT_SYMLINK_NOFOLLOW)
+		error = vfs_lstat_fd(dfd, filename, &stat);
+	else
+		error = vfs_stat_fd(dfd, filename, &stat);
+
+	if (!error)
+		error = cp_new_stat(&stat, statbuf);
+
+out:
+	return error;
+}
+#endif
+
+SYSCALL_DEFINE2(newfstat, unsigned int, fd, struct stat __user *, statbuf)
+{
+	struct kstat stat;
+	int error = vfs_fstat(fd, &stat);
+
+	if (!error)
+		error = cp_new_stat(&stat, statbuf);
+
+	return error;
+}
+
+SYSCALL_DEFINE4(readlinkat, int, dfd, const char __user *, pathname,
+		char __user *, buf, int, bufsiz)
+{
+	struct path path;
+	int error;
+
+	if (bufsiz <= 0)
+		return -EINVAL;
+
+	error = user_path_at(dfd, pathname, 0, &path);
+	if (!error) {
+		struct inode *inode = path.dentry->d_inode;
+
+		error = -EINVAL;
+		if (inode->i_op && inode->i_op->readlink) {
+			error = security_inode_readlink(path.dentry);
+			if (!error) {
+				touch_atime(path.mnt, path.dentry);
+				error = inode->i_op->readlink(path.dentry,
+							      buf, bufsiz);
+			}
+		}
+		path_put(&path);
+	}
+	return error;
+}
+
+SYSCALL_DEFINE3(readlink, const char __user *, path, char __user *, buf,
+		int, bufsiz)
+{
+	return sys_readlinkat(AT_FDCWD, path, buf, bufsiz);
+}
+
+
+/* ---------- LFS-64 ----------- */
+#ifdef __ARCH_WANT_STAT64
+
+static long cp_new_stat64(struct kstat *stat, struct stat64 __user *statbuf)
+{
+	struct stat64 tmp;
+
+	memset(&tmp, 0, sizeof(struct stat64));
+#ifdef CONFIG_MIPS
+	/* mips has weird padding, so we don't get 64 bits there */
+	if (!new_valid_dev(stat->dev) || !new_valid_dev(stat->rdev))
+		return -EOVERFLOW;
+	tmp.st_dev = new_encode_dev(stat->dev);
+	tmp.st_rdev = new_encode_dev(stat->rdev);
+#else
+	tmp.st_dev = huge_encode_dev(stat->dev);
+	tmp.st_rdev = huge_encode_dev(stat->rdev);
+#endif
+	tmp.st_ino = stat->ino;
+	if (sizeof(tmp.st_ino) < sizeof(stat->ino) && tmp.st_ino != stat->ino)
+		return -EOVERFLOW;
+#ifdef STAT64_HAS_BROKEN_ST_INO
+	tmp.__st_ino = stat->ino;
+#endif
+	tmp.st_mode = stat->mode;
+	tmp.st_nlink = stat->nlink;
+	tmp.st_uid = stat->uid;
+	tmp.st_gid = stat->gid;
+	tmp.st_atime = stat->atime.tv_sec;
+	tmp.st_atime_nsec = stat->atime.tv_nsec;
+	tmp.st_mtime = stat->mtime.tv_sec;
+	tmp.st_mtime_nsec = stat->mtime.tv_nsec;
+	tmp.st_ctime = stat->ctime.tv_sec;
+	tmp.st_ctime_nsec = stat->ctime.tv_nsec;
+	tmp.st_size = stat->size;
+	tmp.st_blocks = stat->blocks;
+	tmp.st_blksize = stat->blksize;
+	return copy_to_user(statbuf,&tmp,sizeof(tmp)) ? -EFAULT : 0;
+}
+
+SYSCALL_DEFINE2(stat64, char __user *, filename, struct stat64 __user *, statbuf)
+{
+	struct kstat stat;
+	int error = vfs_stat(filename, &stat);
+
+	if (!error)
+		error = cp_new_stat64(&stat, statbuf);
+
+	return error;
+}
+
+SYSCALL_DEFINE2(lstat64, char __user *, filename, struct stat64 __user *, statbuf)
+{
+	struct kstat stat;
+	int error = vfs_lstat(filename, &stat);
+
+	if (!error)
+		error = cp_new_stat64(&stat, statbuf);
+
+	return error;
+}
+
+SYSCALL_DEFINE2(fstat64, unsigned long, fd, struct stat64 __user *, statbuf)
+{
+	struct kstat stat;
+	int error = vfs_fstat(fd, &stat);
+
+	if (!error)
+		error = cp_new_stat64(&stat, statbuf);
+
+	return error;
+}
+
+SYSCALL_DEFINE4(fstatat64, int, dfd, char __user *, filename,
+		struct stat64 __user *, statbuf, int, flag)
+{
+	struct kstat stat;
+	int error = -EINVAL;
+
+	if ((flag & ~AT_SYMLINK_NOFOLLOW) != 0)
+		goto out;
+
+	if (flag & AT_SYMLINK_NOFOLLOW)
+		error = vfs_lstat_fd(dfd, filename, &stat);
+	else
+		error = vfs_stat_fd(dfd, filename, &stat);
+
+	if (!error)
+		error = cp_new_stat64(&stat, statbuf);
+
+out:
+	return error;
+}
+#endif /* __ARCH_WANT_STAT64 */
+
+void inode_add_bytes(struct inode *inode, loff_t bytes)
+{
+	spin_lock(&inode->i_lock);
+	inode->i_blocks += bytes >> 9;
+	bytes &= 511;
+	inode->i_bytes += bytes;
+	if (inode->i_bytes >= 512) {
+		inode->i_blocks++;
+		inode->i_bytes -= 512;
+	}
+	spin_unlock(&inode->i_lock);
+}
+
+EXPORT_SYMBOL(inode_add_bytes);
+
+void inode_sub_bytes(struct inode *inode, loff_t bytes)
+{
+	spin_lock(&inode->i_lock);
+	inode->i_blocks -= bytes >> 9;
+	bytes &= 511;
+	if (inode->i_bytes < bytes) {
+		inode->i_blocks--;
+		inode->i_bytes += 512;
+	}
+	inode->i_bytes -= bytes;
+	spin_unlock(&inode->i_lock);
+}
+
+EXPORT_SYMBOL(inode_sub_bytes);
+
+loff_t inode_get_bytes(struct inode *inode)
+{
+	loff_t ret;
+
+	spin_lock(&inode->i_lock);
+	ret = (((loff_t)inode->i_blocks) << 9) + inode->i_bytes;
+	spin_unlock(&inode->i_lock);
+	return ret;
+}
+
+EXPORT_SYMBOL(inode_get_bytes);
+
+void inode_set_bytes(struct inode *inode, loff_t bytes)
+{
+	/* Caller is here responsible for sufficient locking
+	 * (ie. inode->i_lock) */
+	inode->i_blocks = bytes >> 9;
+	inode->i_bytes = bytes & 511;
+}
+
+EXPORT_SYMBOL(inode_set_bytes);