[PATCH] vfs: allow custom EOF in generic_file_llseek code

[Eric Sandeen <sandeen@redhat.com>]

For ext3/4 htree directories, using the vfs llseek function with
SEEK_END goes to i_size like for any other file, but in reality
we want the maximum possible hash value.  Recent changes
in ext4 have cut & pasted generic_file_llseek() back into fs/ext4/dir.c,
but replicating this core code seems like a bad idea, especially
since the copy has already diverged from the vfs.

This patch implements a version of generic_file_llseek which can accept
both a custom maximum offset, and a custom EOF position.  With this
in place, ext4_dir_llseek can pass in the appropriate maximum hash
position for both maxsize and eof, and get what it wants.

As far as I know, this does not fix any bugs - nfs in the kernel
doesn't use SEEK_END, and I don't know of any user who does.  But
some ext4 folks seem keen on doing the right thing here, and I can't
really argue.

(Patch also fixes up some comments slightly)

Signed-off-by: Eric Sandeen <sandeen@redhat.com>
---


diff --git a/fs/read_write.c b/fs/read_write.c
index ffc99d2..ecd1828 100644
--- a/fs/read_write.c
+++ b/fs/read_write.c
@@ -51,14 +51,15 @@ static loff_t lseek_execute(struct file *file, struct inode *inode,
 }
 
 /**
- * generic_file_llseek_size - generic llseek implementation for regular files
+ * generic_file_llseek_size_eof - generic llseek implementation for regular files
  * @file:	file structure to seek on
  * @offset:	file offset to seek to
  * @origin:	type of seek
- * @size:	max size of file system
+ * @size:	max size of this file in file system
+ * @eof:	offset used for SEEK_END position
  *
  * This is a variant of generic_file_llseek that allows passing in a custom
- * file size.
+ * maximum file size and a custom EOF position, for e.g. hashed directories
  *
  * Synchronization:
  * SEEK_SET and SEEK_END are unsynchronized (but atomic on 64bit platforms)
@@ -66,14 +67,14 @@ static loff_t lseek_execute(struct file *file, struct inode *inode,
  * read/writes behave like SEEK_SET against seeks.
  */
 loff_t
-generic_file_llseek_size(struct file *file, loff_t offset, int origin,
-		loff_t maxsize)
+generic_file_llseek_size_eof(struct file *file, loff_t offset, int origin,
+		loff_t maxsize, loff_t eof)
 {
 	struct inode *inode = file->f_mapping->host;
 
 	switch (origin) {
 	case SEEK_END:
-		offset += i_size_read(inode);
+		offset += eof;
 		break;
 	case SEEK_CUR:
 		/*
@@ -99,7 +100,7 @@ generic_file_llseek_size(struct file *file, loff_t offset, int origin,
 		 * In the generic case the entire file is data, so as long as
 		 * offset isn't at the end of the file then the offset is data.
 		 */
-		if (offset >= i_size_read(inode))
+		if (offset >= eof)
 			return -ENXIO;
 		break;
 	case SEEK_HOLE:
@@ -107,14 +108,35 @@ generic_file_llseek_size(struct file *file, loff_t offset, int origin,
 		 * There is a virtual hole at the end of the file, so as long as
 		 * offset isn't i_size or larger, return i_size.
 		 */
-		if (offset >= i_size_read(inode))
+		if (offset >= eof)
 			return -ENXIO;
-		offset = i_size_read(inode);
+		offset = eof;
 		break;
 	}
 
 	return lseek_execute(file, inode, offset, maxsize);
 }
+EXPORT_SYMBOL(generic_file_llseek_size_eof);
+
+/**
+ * generic_file_llseek_size - generic llseek implementation for regular files
+ * @file:	file structure to seek on
+ * @offset:	file offset to seek to
+ * @origin:	type of seek
+ * @size:	max size of this file in file system
+ *
+ * This is a variant of generic_file_llseek that allows passing in a custom
+ * maximum file size.
+ */
+loff_t
+generic_file_llseek_size(struct file *file, loff_t offset, int origin,
+		loff_t maxsize)
+{
+	struct inode *inode = file->f_mapping->host;
+
+	return generic_file_llseek_size_eof(file, offset, origin, maxsize,
+					i_size_read(inode));
+}
 EXPORT_SYMBOL(generic_file_llseek_size);
 
 /**
@@ -131,8 +153,9 @@ loff_t generic_file_llseek(struct file *file, loff_t offset, int origin)
 {
 	struct inode *inode = file->f_mapping->host;
 
-	return generic_file_llseek_size(file, offset, origin,
-					inode->i_sb->s_maxbytes);
+	return generic_file_llseek_size_eof(file, offset, origin,
+					inode->i_sb->s_maxbytes,
+					i_size_read(inode));
 }
 EXPORT_SYMBOL(generic_file_llseek);
 
diff --git a/include/linux/fs.h b/include/linux/fs.h
index 8de6755..a6ae7a4 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -2402,6 +2402,8 @@ extern loff_t no_llseek(struct file *file, loff_t offset, int origin);
 extern loff_t generic_file_llseek(struct file *file, loff_t offset, int origin);
 extern loff_t generic_file_llseek_size(struct file *file, loff_t offset,
 		int origin, loff_t maxsize);
+extern loff_t generic_file_llseek_size_eof(struct file *file, loff_t offset,
+		int origin, loff_t maxsize, loff_t eof);
 extern int generic_file_open(struct inode * inode, struct file * filp);
 extern int nonseekable_open(struct inode * inode, struct file * filp);