[patch 04/11] fs: convert simple fs to new truncate

[npiggin@suse.de]

[-- Attachment #1: fs-simple-new-truncate.patch --]
[-- Type: text/plain, Size: 3289 bytes --]

Convert simple filesystems: ramfs, configfs, sysfs to new truncate sequence.

Signed-off-by: Nick Piggin <npiggin@suse.de>
---
 fs/configfs/inode.c   |   11 ++++++++---
 fs/ramfs/file-mmu.c   |    2 ++
 fs/ramfs/file-nommu.c |    8 +++++---
 fs/sysfs/inode.c      |    7 ++-----
 4 files changed, 17 insertions(+), 11 deletions(-)

Index: linux-2.6/fs/ramfs/file-mmu.c
===================================================================
--- linux-2.6.orig/fs/ramfs/file-mmu.c
+++ linux-2.6/fs/ramfs/file-mmu.c
@@ -50,5 +50,7 @@ const struct file_operations ramfs_file_
 };
 
 const struct inode_operations ramfs_file_inode_operations = {
+	.new_truncate	= 1,
+	.setattr	= simple_setattr,
 	.getattr	= simple_getattr,
 };
Index: linux-2.6/fs/ramfs/file-nommu.c
===================================================================
--- linux-2.6.orig/fs/ramfs/file-nommu.c
+++ linux-2.6/fs/ramfs/file-nommu.c
@@ -48,6 +48,7 @@ const struct file_operations ramfs_file_
 };
 
 const struct inode_operations ramfs_file_inode_operations = {
+	.new_truncate		= 1,
 	.setattr		= ramfs_nommu_setattr,
 	.getattr		= simple_getattr,
 };
@@ -169,7 +170,7 @@ static int ramfs_nommu_resize(struct ino
 			return ret;
 	}
 
-	ret = vmtruncate(inode, newsize);
+	ret = simple_setsize(inode, newsize);
 
 	return ret;
 }
@@ -192,7 +193,8 @@ static int ramfs_nommu_setattr(struct de
 
 	/* pick out size-changing events */
 	if (ia->ia_valid & ATTR_SIZE) {
-		loff_t size = i_size_read(inode);
+		loff_t size = inode->i_size;
+
 		if (ia->ia_size != size) {
 			ret = ramfs_nommu_resize(inode, ia->ia_size, size);
 			if (ret < 0 || ia->ia_valid == ATTR_SIZE)
@@ -205,7 +207,7 @@ static int ramfs_nommu_setattr(struct de
 		}
 	}
 
-	ret = inode_setattr(inode, ia);
+	generic_setattr(inode, ia);
  out:
 	ia->ia_valid = old_ia_valid;
 	return ret;
Index: linux-2.6/fs/configfs/inode.c
===================================================================
--- linux-2.6.orig/fs/configfs/inode.c
+++ linux-2.6/fs/configfs/inode.c
@@ -56,6 +56,7 @@ static struct backing_dev_info configfs_
 };
 
 static const struct inode_operations configfs_inode_operations ={
+	.new_truncate	= 1,
 	.setattr	= configfs_setattr,
 };
 
@@ -76,9 +77,13 @@ int configfs_setattr(struct dentry * den
 	if (error)
 		return error;
 
-	error = inode_setattr(inode, iattr);
-	if (error)
-		return error;
+	if (iattr->ia_valid & ATTR_SIZE) {
+		error = simple_setsize(inode, iattr->ia_size);
+		if (error)
+			return error;
+	}
+
+	generic_setattr(inode, iattr);
 
 	if (!sd_iattr) {
 		/* setting attributes for the first time, allocate now */
Index: linux-2.6/fs/sysfs/inode.c
===================================================================
--- linux-2.6.orig/fs/sysfs/inode.c
+++ linux-2.6/fs/sysfs/inode.c
@@ -34,6 +34,7 @@ static struct backing_dev_info sysfs_bac
 };
 
 static const struct inode_operations sysfs_inode_operations ={
+	.new_truncate	= 1,
 	.setattr	= sysfs_setattr,
 };
 
@@ -59,11 +60,7 @@ int sysfs_setattr(struct dentry * dentry
 	if (error)
 		return error;
 
-	iattr->ia_valid &= ~ATTR_SIZE; /* ignore size changes */
-
-	error = inode_setattr(inode, iattr);
-	if (error)
-		return error;
+	generic_setattr(inode, iattr);
 
 	if (!sd_iattr) {
 		/* setting attributes for the first time, allocate now */