[PATCH] Streamline generic_file_* interfaces and filemap cleanups

This patch cleans up generic_file_*_read/write() interfaces.  Christoph
Hellwig gave me the idea for this clean ups.

In a nutshell, all filesystems should set .aio_read/.aio_write methods and use
do_sync_read/ do_sync_write() as their .read/.write methods.  This allows us
to cleanup all variants of generic_file_* routines.

Final available interfaces:

generic_file_aio_read() - read handler
generic_file_aio_write() - write handler
generic_file_aio_write_nolock() - no lock write handler

__generic_file_aio_write_nolock() - internal worker routine

Signed-off-by: Badari Pulavarty <pbadari@us.ibm.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

24 files changed, 99 insertions, 64 deletions

diff --git a/fs/adfs/file.c b/fs/adfs/file.c
index 1014b9f..6101ea6 100644
--- a/fs/adfs/file.c
+++ b/fs/adfs/file.c
@@ -27,10 +27,12 @@
 
 const struct file_operations adfs_file_operations = {
 	.llseek		= generic_file_llseek,
-	.read		= generic_file_read,
+	.read		= do_sync_read,
+	.aio_read	= generic_file_aio_read,
 	.mmap		= generic_file_mmap,
 	.fsync		= file_fsync,
-	.write		= generic_file_write,
+	.write		= do_sync_write,
+	.aio_write	= generic_file_aio_write,
 	.sendfile	= generic_file_sendfile,
 };
 
diff --git a/fs/affs/file.c b/fs/affs/file.c
index 3de8590..05b5e22 100644
--- a/fs/affs/file.c
+++ b/fs/affs/file.c
@@ -27,8 +27,10 @@ static int affs_file_release(struct inode *inode, struct file *filp);
 
 const struct file_operations affs_file_operations = {
 	.llseek		= generic_file_llseek,
-	.read		= generic_file_read,
-	.write		= generic_file_write,
+	.read		= do_sync_read,
+	.aio_read	= generic_file_aio_read,
+	.write		= do_sync_write,
+	.aio_write	= generic_file_aio_write,
 	.mmap		= generic_file_mmap,
 	.open		= affs_file_open,
 	.release	= affs_file_release,
diff --git a/fs/bfs/file.c b/fs/bfs/file.c
index 3d5aca2..a9164a8 100644
--- a/fs/bfs/file.c
+++ b/fs/bfs/file.c
@@ -19,8 +19,10 @@
 
 const struct file_operations bfs_file_operations = {
 	.llseek 	= generic_file_llseek,
-	.read		= generic_file_read,
-	.write		= generic_file_write,
+	.read		= do_sync_read,
+	.aio_read	= generic_file_aio_read,
+	.write		= do_sync_write,
+	.aio_write	= generic_file_aio_write,
 	.mmap		= generic_file_mmap,
 	.sendfile	= generic_file_sendfile,
 };
diff --git a/fs/block_dev.c b/fs/block_dev.c
index 0f14309..bc8f27c 100644
--- a/fs/block_dev.c
+++ b/fs/block_dev.c
@@ -1154,14 +1154,6 @@ static int blkdev_close(struct inode * inode, struct file * filp)
 	return blkdev_put(bdev);
 }
 
-static ssize_t blkdev_file_write(struct file *file, const char __user *buf,
-				   size_t count, loff_t *ppos)
-{
-	struct iovec local_iov = { .iov_base = (void __user *)buf, .iov_len = count };
-
-	return generic_file_write_nolock(file, &local_iov, 1, ppos);
-}
-
 static long block_ioctl(struct file *file, unsigned cmd, unsigned long arg)
 {
 	return blkdev_ioctl(file->f_mapping->host, file, cmd, arg);
@@ -1181,8 +1173,8 @@ const struct file_operations def_blk_fops = {
 	.open		= blkdev_open,
 	.release	= blkdev_close,
 	.llseek		= block_llseek,
-	.read		= generic_file_read,
-	.write		= blkdev_file_write,
+	.read		= do_sync_read,
+	.write		= do_sync_write,
   	.aio_read	= generic_file_aio_read,
   	.aio_write	= generic_file_aio_write_nolock,
 	.mmap		= generic_file_mmap,
diff --git a/fs/ext2/file.c b/fs/ext2/file.c
index e893e2b..2dba473 100644
--- a/fs/ext2/file.c
+++ b/fs/ext2/file.c
@@ -41,8 +41,8 @@ static int ext2_release_file (struct inode * inode, struct file * filp)
  */
 const struct file_operations ext2_file_operations = {
 	.llseek		= generic_file_llseek,
-	.read		= generic_file_read,
-	.write		= generic_file_write,
+	.read		= do_sync_read,
+	.write		= do_sync_write,
 	.aio_read	= generic_file_aio_read,
 	.aio_write	= generic_file_aio_write,
 	.ioctl		= ext2_ioctl,
diff --git a/fs/fuse/file.c b/fs/fuse/file.c
index 5c4fcd1..1836268 100644
--- a/fs/fuse/file.c
+++ b/fs/fuse/file.c
@@ -753,8 +753,10 @@ static int fuse_file_lock(struct file *file, int cmd, struct file_lock *fl)
 
 static const struct file_operations fuse_file_operations = {
 	.llseek		= generic_file_llseek,
-	.read		= generic_file_read,
-	.write		= generic_file_write,
+	.read		= do_sync_read,
+	.aio_read	= generic_file_aio_read,
+	.write		= do_sync_write,
+	.aio_write	= generic_file_aio_write,
 	.mmap		= fuse_file_mmap,
 	.open		= fuse_open,
 	.flush		= fuse_flush,
diff --git a/fs/hfs/inode.c b/fs/hfs/inode.c
index d05641c..02f5573 100644
--- a/fs/hfs/inode.c
+++ b/fs/hfs/inode.c
@@ -601,8 +601,10 @@ int hfs_inode_setattr(struct dentry *dentry, struct iattr * attr)
 
 static const struct file_operations hfs_file_operations = {
 	.llseek		= generic_file_llseek,
-	.read		= generic_file_read,
-	.write		= generic_file_write,
+	.read		= do_sync_read,
+	.aio_read	= generic_file_aio_read,
+	.write		= do_sync_write,
+	.aio_write	= generic_file_aio_write,
 	.mmap		= generic_file_mmap,
 	.sendfile	= generic_file_sendfile,
 	.fsync		= file_fsync,
diff --git a/fs/hfsplus/inode.c b/fs/hfsplus/inode.c
index 0eb1a60..9e36752 100644
--- a/fs/hfsplus/inode.c
+++ b/fs/hfsplus/inode.c
@@ -282,8 +282,10 @@ static struct inode_operations hfsplus_file_inode_operations = {
 
 static const struct file_operations hfsplus_file_operations = {
 	.llseek 	= generic_file_llseek,
-	.read		= generic_file_read,
-	.write		= generic_file_write,
+	.read		= do_sync_read,
+	.aio_read	= generic_file_aio_read,
+	.write		= do_sync_write,
+	.aio_write	= generic_file_aio_write,
 	.mmap		= generic_file_mmap,
 	.sendfile	= generic_file_sendfile,
 	.fsync		= file_fsync,
diff --git a/fs/hostfs/hostfs_kern.c b/fs/hostfs/hostfs_kern.c
index 4908c38..b6bd33c 100644
--- a/fs/hostfs/hostfs_kern.c
+++ b/fs/hostfs/hostfs_kern.c
@@ -385,11 +385,11 @@ int hostfs_fsync(struct file *file, struct dentry *dentry, int datasync)
 
 static const struct file_operations hostfs_file_fops = {
 	.llseek		= generic_file_llseek,
-	.read		= generic_file_read,
+	.read		= do_sync_read,
 	.sendfile	= generic_file_sendfile,
 	.aio_read	= generic_file_aio_read,
 	.aio_write	= generic_file_aio_write,
-	.write		= generic_file_write,
+	.write		= do_sync_write,
 	.mmap		= generic_file_mmap,
 	.open		= hostfs_file_open,
 	.release	= NULL,
diff --git a/fs/hpfs/file.c b/fs/hpfs/file.c
index d9eb19b..8b94d24 100644
--- a/fs/hpfs/file.c
+++ b/fs/hpfs/file.c
@@ -113,7 +113,7 @@ static ssize_t hpfs_file_write(struct file *file, const char __user *buf,
 {
 	ssize_t retval;
 
-	retval = generic_file_write(file, buf, count, ppos);
+	retval = do_sync_write(file, buf, count, ppos);
 	if (retval > 0)
 		hpfs_i(file->f_dentry->d_inode)->i_dirty = 1;
 	return retval;
@@ -122,8 +122,10 @@ static ssize_t hpfs_file_write(struct file *file, const char __user *buf,
 const struct file_operations hpfs_file_ops =
 {
 	.llseek		= generic_file_llseek,
-	.read		= generic_file_read,
+	.read		= do_sync_read,
+	.aio_read	= generic_file_aio_read,
 	.write		= hpfs_file_write,
+	.aio_write	= generic_file_aio_write,
 	.mmap		= generic_file_mmap,
 	.release	= hpfs_file_release,
 	.fsync		= hpfs_file_fsync,
diff --git a/fs/jffs/inode-v23.c b/fs/jffs/inode-v23.c
index f5cf9c9..068ef0d 100644
--- a/fs/jffs/inode-v23.c
+++ b/fs/jffs/inode-v23.c
@@ -1632,8 +1632,10 @@ static const struct file_operations jffs_file_operations =
 {
 	.open		= generic_file_open,
 	.llseek		= generic_file_llseek,
-	.read		= generic_file_read,
-	.write		= generic_file_write,
+	.read		= do_sync_read,
+	.aio_read	= generic_file_aio_read,
+	.write		= do_sync_write,
+	.aio_write	= generic_file_aio_write,
 	.ioctl		= jffs_ioctl,
 	.mmap		= generic_file_readonly_mmap,
 	.fsync		= jffs_fsync,
diff --git a/fs/jffs2/file.c b/fs/jffs2/file.c
index 3ed6e3e..242875f 100644
--- a/fs/jffs2/file.c
+++ b/fs/jffs2/file.c
@@ -42,8 +42,10 @@ const struct file_operations jffs2_file_operations =
 {
 	.llseek =	generic_file_llseek,
 	.open =		generic_file_open,
-	.read =		generic_file_read,
-	.write =	generic_file_write,
+ 	.read =		do_sync_read,
+ 	.aio_read =	generic_file_aio_read,
+ 	.write =	do_sync_write,
+ 	.aio_write =	generic_file_aio_write,
 	.ioctl =	jffs2_ioctl,
 	.mmap =		generic_file_readonly_mmap,
 	.fsync =	jffs2_fsync,
diff --git a/fs/jfs/file.c b/fs/jfs/file.c
index f535f29..976e90d 100644
--- a/fs/jfs/file.c
+++ b/fs/jfs/file.c
@@ -103,8 +103,8 @@ struct inode_operations jfs_file_inode_operations = {
 const struct file_operations jfs_file_operations = {
 	.open		= jfs_open,
 	.llseek		= generic_file_llseek,
-	.write		= generic_file_write,
-	.read		= generic_file_read,
+	.write		= do_sync_write,
+	.read		= do_sync_read,
 	.aio_read	= generic_file_aio_read,
 	.aio_write	= generic_file_aio_write,
 	.mmap		= generic_file_mmap,
diff --git a/fs/minix/file.c b/fs/minix/file.c
index 420b328..40eac2e 100644
--- a/fs/minix/file.c
+++ b/fs/minix/file.c
@@ -17,8 +17,10 @@ int minix_sync_file(struct file *, struct dentry *, int);
 
 const struct file_operations minix_file_operations = {
 	.llseek		= generic_file_llseek,
-	.read		= generic_file_read,
-	.write		= generic_file_write,
+	.read		= do_sync_read,
+	.aio_read	= generic_file_aio_read,
+	.write		= do_sync_write,
+	.aio_write	= generic_file_aio_write,
 	.mmap		= generic_file_mmap,
 	.fsync		= minix_sync_file,
 	.sendfile	= generic_file_sendfile,
diff --git a/fs/ntfs/file.c b/fs/ntfs/file.c
index 2f9b5a0..ae2fe00 100644
--- a/fs/ntfs/file.c
+++ b/fs/ntfs/file.c
@@ -2296,7 +2296,7 @@ static int ntfs_file_fsync(struct file *filp, struct dentry *dentry,
 
 const struct file_operations ntfs_file_ops = {
 	.llseek		= generic_file_llseek,	 /* Seek inside file. */
-	.read		= generic_file_read,	 /* Read from file. */
+	.read		= do_sync_read,		 /* Read from file. */
 	.aio_read	= generic_file_aio_read, /* Async read from file. */
 #ifdef NTFS_RW
 	.write		= ntfs_file_write,	 /* Write to file. */
diff --git a/fs/qnx4/file.c b/fs/qnx4/file.c
index 62af4b1..467e5ac 100644
--- a/fs/qnx4/file.c
+++ b/fs/qnx4/file.c
@@ -22,11 +22,13 @@
 const struct file_operations qnx4_file_operations =
 {
 	.llseek		= generic_file_llseek,
-	.read		= generic_file_read,
+	.read		= do_sync_read,
+	.aio_read	= generic_file_aio_read,
 	.mmap		= generic_file_mmap,
 	.sendfile	= generic_file_sendfile,
 #ifdef CONFIG_QNX4FS_RW
-	.write		= generic_file_write,
+	.write		= do_sync_write,
+	.aio_write	= generic_file_aio_write,
 	.fsync		= qnx4_sync_file,
 #endif
 };
diff --git a/fs/ramfs/file-mmu.c b/fs/ramfs/file-mmu.c
index 86f14ca..0947fb5 100644
--- a/fs/ramfs/file-mmu.c
+++ b/fs/ramfs/file-mmu.c
@@ -33,8 +33,10 @@ const struct address_space_operations ramfs_aops = {
 };
 
 const struct file_operations ramfs_file_operations = {
-	.read		= generic_file_read,
-	.write		= generic_file_write,
+	.read		= do_sync_read,
+	.aio_read	= generic_file_aio_read,
+	.write		= do_sync_write,
+	.aio_write	= generic_file_aio_write,
 	.mmap		= generic_file_mmap,
 	.fsync		= simple_sync_file,
 	.sendfile	= generic_file_sendfile,
diff --git a/fs/ramfs/file-nommu.c b/fs/ramfs/file-nommu.c
index 677139b..bfe5dbf 100644
--- a/fs/ramfs/file-nommu.c
+++ b/fs/ramfs/file-nommu.c
@@ -36,8 +36,10 @@ const struct address_space_operations ramfs_aops = {
 const struct file_operations ramfs_file_operations = {
 	.mmap			= ramfs_nommu_mmap,
 	.get_unmapped_area	= ramfs_nommu_get_unmapped_area,
-	.read			= generic_file_read,
-	.write			= generic_file_write,
+	.read			= do_sync_read,
+	.aio_read		= generic_file_aio_read,
+	.write			= do_sync_write,
+	.aio_write		= generic_file_aio_write,
 	.fsync			= simple_sync_file,
 	.sendfile		= generic_file_sendfile,
 	.llseek			= generic_file_llseek,
diff --git a/fs/read_write.c b/fs/read_write.c
index 32d54cc..4ed839b 100644
--- a/fs/read_write.c
+++ b/fs/read_write.c
@@ -22,7 +22,8 @@
 
 const struct file_operations generic_ro_fops = {
 	.llseek		= generic_file_llseek,
-	.read		= generic_file_read,
+	.read		= do_sync_read,
+	.aio_read	= generic_file_aio_read,
 	.mmap		= generic_file_readonly_mmap,
 	.sendfile	= generic_file_sendfile,
 };
diff --git a/fs/smbfs/file.c b/fs/smbfs/file.c
index dae6704..50784d1 100644
--- a/fs/smbfs/file.c
+++ b/fs/smbfs/file.c
@@ -214,13 +214,15 @@ smb_updatepage(struct file *file, struct page *page, unsigned long offset,
 }
 
 static ssize_t
-smb_file_read(struct file * file, char __user * buf, size_t count, loff_t *ppos)
+smb_file_aio_read(struct kiocb *iocb, const struct iovec *iov,
+			unsigned long nr_segs, loff_t pos)
 {
+	struct file * file = iocb->ki_filp;
 	struct dentry * dentry = file->f_dentry;
 	ssize_t	status;
 
 	VERBOSE("file %s/%s, count=%lu@%lu\n", DENTRY_PATH(dentry),
-		(unsigned long) count, (unsigned long) *ppos);
+		(unsigned long) iocb->ki_left, (unsigned long) pos);
 
 	status = smb_revalidate_inode(dentry);
 	if (status) {
@@ -233,7 +235,7 @@ smb_file_read(struct file * file, char __user * buf, size_t count, loff_t *ppos)
 		(long)dentry->d_inode->i_size,
 		dentry->d_inode->i_flags, dentry->d_inode->i_atime);
 
-	status = generic_file_read(file, buf, count, ppos);
+	status = generic_file_aio_read(iocb, iov, nr_segs, pos);
 out:
 	return status;
 }
@@ -317,14 +319,16 @@ const struct address_space_operations smb_file_aops = {
  * Write to a file (through the page cache).
  */
 static ssize_t
-smb_file_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos)
+smb_file_aio_write(struct kiocb *iocb, const struct iovec *iov,
+			       unsigned long nr_segs, loff_t pos)
 {
+	struct file * file = iocb->ki_filp;
 	struct dentry * dentry = file->f_dentry;
 	ssize_t	result;
 
 	VERBOSE("file %s/%s, count=%lu@%lu\n",
 		DENTRY_PATH(dentry),
-		(unsigned long) count, (unsigned long) *ppos);
+		(unsigned long) iocb->ki_left, (unsigned long) pos);
 
 	result = smb_revalidate_inode(dentry);
 	if (result) {
@@ -337,8 +341,8 @@ smb_file_write(struct file *file, const char __user *buf, size_t count, loff_t *
 	if (result)
 		goto out;
 
-	if (count > 0) {
-		result = generic_file_write(file, buf, count, ppos);
+	if (iocb->ki_left > 0) {
+		result = generic_file_aio_write(iocb, iov, nr_segs, pos);
 		VERBOSE("pos=%ld, size=%ld, mtime=%ld, atime=%ld\n",
 			(long) file->f_pos, (long) dentry->d_inode->i_size,
 			dentry->d_inode->i_mtime, dentry->d_inode->i_atime);
@@ -402,8 +406,10 @@ smb_file_permission(struct inode *inode, int mask, struct nameidata *nd)
 const struct file_operations smb_file_operations =
 {
 	.llseek		= remote_llseek,
-	.read		= smb_file_read,
-	.write		= smb_file_write,
+	.read		= do_sync_read,
+	.aio_read	= smb_file_aio_read,
+	.write		= do_sync_write,
+	.aio_write	= smb_file_aio_write,
 	.ioctl		= smb_ioctl,
 	.mmap		= smb_file_mmap,
 	.open		= smb_file_open,
diff --git a/fs/sysv/file.c b/fs/sysv/file.c
index a59e303..47a4b72 100644
--- a/fs/sysv/file.c
+++ b/fs/sysv/file.c
@@ -21,8 +21,10 @@
  */
 const struct file_operations sysv_file_operations = {
 	.llseek		= generic_file_llseek,
-	.read		= generic_file_read,
-	.write		= generic_file_write,
+	.read		= do_sync_read,
+	.aio_read	= generic_file_aio_read,
+	.write		= do_sync_write,
+	.aio_write	= generic_file_aio_write,
 	.mmap		= generic_file_mmap,
 	.fsync		= sysv_sync_file,
 	.sendfile	= generic_file_sendfile,
diff --git a/fs/udf/file.c b/fs/udf/file.c
index a59e5f3..7aedd55 100644
--- a/fs/udf/file.c
+++ b/fs/udf/file.c
@@ -103,19 +103,21 @@ const struct address_space_operations udf_adinicb_aops = {
 	.commit_write		= udf_adinicb_commit_write,
 };
 
-static ssize_t udf_file_write(struct file * file, const char __user * buf,
-	size_t count, loff_t *ppos)
+static ssize_t udf_file_aio_write(struct kiocb *iocb, const struct iovec *iov,
+			      unsigned long nr_segs, loff_t ppos)
 {
 	ssize_t retval;
+	struct file *file = iocb->ki_filp;
 	struct inode *inode = file->f_dentry->d_inode;
 	int err, pos;
+	size_t count = iocb->ki_left;
 
 	if (UDF_I_ALLOCTYPE(inode) == ICBTAG_FLAG_AD_IN_ICB)
 	{
 		if (file->f_flags & O_APPEND)
 			pos = inode->i_size;
 		else
-			pos = *ppos;
+			pos = ppos;
 
 		if (inode->i_sb->s_blocksize < (udf_file_entry_alloc_offset(inode) +
 			pos + count))
@@ -136,7 +138,7 @@ static ssize_t udf_file_write(struct file * file, const char __user * buf,
 		}
 	}
 
-	retval = generic_file_write(file, buf, count, ppos);
+	retval = generic_file_aio_write(iocb, iov, nr_segs, ppos);
 
 	if (retval > 0)
 		mark_inode_dirty(inode);
@@ -249,11 +251,13 @@ static int udf_release_file(struct inode * inode, struct file * filp)
 }
 
 const struct file_operations udf_file_operations = {
-	.read			= generic_file_read,
+	.read			= do_sync_read,
+	.aio_read		= generic_file_aio_read,
 	.ioctl			= udf_ioctl,
 	.open			= generic_file_open,
 	.mmap			= generic_file_mmap,
-	.write			= udf_file_write,
+	.write			= do_sync_write,
+	.aio_write		= udf_file_aio_write,
 	.release		= udf_release_file,
 	.fsync			= udf_fsync_file,
 	.sendfile		= generic_file_sendfile,
diff --git a/fs/ufs/file.c b/fs/ufs/file.c
index a9c6e5f..1e09632 100644
--- a/fs/ufs/file.c
+++ b/fs/ufs/file.c
@@ -53,8 +53,10 @@ static int ufs_sync_file(struct file *file, struct dentry *dentry, int datasync)
  
 const struct file_operations ufs_file_operations = {
 	.llseek		= generic_file_llseek,
-	.read		= generic_file_read,
-	.write		= generic_file_write,
+	.read		= do_sync_read,
+	.aio_read	= generic_file_aio_read,
+	.write		= do_sync_write,
+	.aio_write	= generic_file_aio_write,
 	.mmap		= generic_file_mmap,
 	.open           = generic_file_open,
 	.fsync		= ufs_sync_file,
diff --git a/fs/xfs/linux-2.6/xfs_lrw.c b/fs/xfs/linux-2.6/xfs_lrw.c
index 55992b4..fa842f1 100644
--- a/fs/xfs/linux-2.6/xfs_lrw.c
+++ b/fs/xfs/linux-2.6/xfs_lrw.c
@@ -279,7 +279,9 @@ xfs_read(
 
 	xfs_rw_enter_trace(XFS_READ_ENTER, &ip->i_iocore,
 				(void *)iovp, segs, *offset, ioflags);
-	ret = __generic_file_aio_read(iocb, iovp, segs, offset);
+
+	iocb->ki_pos = *offset;
+	ret = generic_file_aio_read(iocb, iovp, segs, *offset);
 	if (ret == -EIOCBQUEUED && !(ioflags & IO_ISAIO))
 		ret = wait_on_sync_kiocb(iocb);
 	if (ret > 0)