patch-2.4.15 linux/fs/ext3/file.c

• Lines: 95
• Date: Thu Nov 15 13:37:55 2001
• Orig file: v2.4.14/linux/fs/ext3/file.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.4.14/linux/fs/ext3/file.c linux/fs/ext3/file.c
@@ -0,0 +1,94 @@
+/*
+ *  linux/fs/ext3/file.c
+ *
+ * Copyright (C) 1992, 1993, 1994, 1995
+ * Remy Card (card@masi.ibp.fr)
+ * Laboratoire MASI - Institut Blaise Pascal
+ * Universite Pierre et Marie Curie (Paris VI)
+ *
+ *  from
+ *
+ *  linux/fs/minix/file.c
+ *
+ *  Copyright (C) 1991, 1992  Linus Torvalds
+ *
+ *  ext3 fs regular file handling primitives
+ *
+ *  64-bit file support on 64-bit platforms by Jakub Jelinek
+ *	(jj@sunsite.ms.mff.cuni.cz)
+ */
+
+#include <linux/sched.h>
+#include <linux/fs.h>
+#include <linux/locks.h>
+#include <linux/jbd.h>
+#include <linux/ext3_fs.h>
+#include <linux/ext3_jbd.h>
+#include <linux/smp_lock.h>
+
+/*
+ * Called when an inode is released. Note that this is different
+ * from ext3_file_open: open gets called at every open, but release
+ * gets called only when /all/ the files are closed.
+ */
+static int ext3_release_file (struct inode * inode, struct file * filp)
+{
+	if (filp->f_mode & FMODE_WRITE)
+		ext3_discard_prealloc (inode);
+	return 0;
+}
+
+/*
+ * Called when an inode is about to be opened.
+ * We use this to disallow opening RW large files on 32bit systems if
+ * the caller didn't specify O_LARGEFILE.  On 64bit systems we force
+ * on this flag in sys_open.
+ */
+static int ext3_open_file (struct inode * inode, struct file * filp)
+{
+	if (!(filp->f_flags & O_LARGEFILE) &&
+	    inode->i_size > 0x7FFFFFFFLL)
+		return -EFBIG;
+	return 0;
+}
+
+/*
+ * ext3_file_write().
+ *
+ * Most things are done in ext3_prepare_write() and ext3_commit_write().
+ */
+
+static ssize_t
+ext3_file_write(struct file *file, const char *buf, size_t count, loff_t *ppos)
+{
+	struct inode *inode = file->f_dentry->d_inode;
+
+	/*
+	 * Nasty: if the file is subject to synchronous writes then we need
+	 * to force generic_osync_inode() to call ext3_write_inode().
+	 * We do that by marking the inode dirty.  This adds much more
+	 * computational expense than we need, but we're going to sync
+	 * anyway.
+	 */
+	if (IS_SYNC(inode) || (file->f_flags & O_SYNC))
+		mark_inode_dirty(inode);
+
+	return generic_file_write(file, buf, count, ppos);
+}
+
+struct file_operations ext3_file_operations = {
+	llseek:		generic_file_llseek,	/* BKL held */
+	read:		generic_file_read,	/* BKL not held.  Don't need */
+	write:		ext3_file_write,	/* BKL not held.  Don't need */
+	ioctl:		ext3_ioctl,		/* BKL held */
+	mmap:		generic_file_mmap,
+	open:		ext3_open_file,		/* BKL not held.  Don't need */
+	release:	ext3_release_file,	/* BKL not held.  Don't need */
+	fsync:		ext3_sync_file,		/* BKL held */
+};
+
+struct inode_operations ext3_file_inode_operations = {
+	truncate:	ext3_truncate,		/* BKL held */
+	setattr:	ext3_setattr,		/* BKL held */
+};
+