check ATTR_SIZE contraints in inode_change_ok

Make sure we check the truncate constraints early on in ->setattr by adding
those checks to inode_change_ok.  Also clean up and document inode_change_ok
to make this obvious.

As a fallout we don't have to call inode_newsize_ok from simple_setsize and
simplify it down to a truncate_setsize which doesn't return an error.  This
simplifies a lot of setattr implementations and means we use truncate_setsize
almost everywhere.  Get rid of fat_setsize now that it's trivial and mark
ext2_setsize static to make the calling convention obvious.

Keep the inode_newsize_ok in vmtruncate for now as all callers need an
audit for its removal anyway.

Note: setattr code in ecryptfs doesn't call inode_change_ok at all and
needs a deeper audit, but that is left for later.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

fs/adfs/inode.c

@@ -333,10 +333,7 @@ adfs_notify_change(struct dentry *dentry, struct iattr *attr)
 
 	/* XXX: this is missing some actual on-disk truncation.. */
 	if (ia_valid & ATTR_SIZE)
-		error = simple_setsize(inode, attr->ia_size);
-
-	if (error)
-		goto out;
+		truncate_setsize(inode, attr->ia_size);
 
 	if (ia_valid & ATTR_MTIME) {
 		inode->i_mtime = attr->ia_mtime;

fs/attr.c

@@ -14,35 +14,53 @@
 #include <linux/fcntl.h>
 #include <linux/security.h>
 
-/* Taken over from the old code... */
-
-/* POSIX UID/GID verification for setting inode attributes. */
+/**
+ * inode_change_ok - check if attribute changes to an inode are allowed
+ * @inode:	inode to check
+ * @attr:	attributes to change
+ *
+ * Check if we are allowed to change the attributes contained in @attr
+ * in the given inode.  This includes the normal unix access permission
+ * checks, as well as checks for rlimits and others.
+ *
+ * Should be called as the first thing in ->setattr implementations,
+ * possibly after taking additional locks.
+ */
 int inode_change_ok(const struct inode *inode, struct iattr *attr)
 {
-	int retval = -EPERM;
 	unsigned int ia_valid = attr->ia_valid;
 
+	/*
+	 * First check size constraints.  These can't be overriden using
+	 * ATTR_FORCE.
+	 */
+	if (ia_valid & ATTR_SIZE) {
+		int error = inode_newsize_ok(inode, attr->ia_size);
+		if (error)
+			return error;
+	}
+
 	/* If force is set do it anyway. */
 	if (ia_valid & ATTR_FORCE)
-		goto fine;
+		return 0;
 
 	/* Make sure a caller can chown. */
 	if ((ia_valid & ATTR_UID) &&
 	    (current_fsuid() != inode->i_uid ||
 	     attr->ia_uid != inode->i_uid) && !capable(CAP_CHOWN))
-		goto error;
+		return -EPERM;
 
 	/* Make sure caller can chgrp. */
 	if ((ia_valid & ATTR_GID) &&
 	    (current_fsuid() != inode->i_uid ||
 	    (!in_group_p(attr->ia_gid) && attr->ia_gid != inode->i_gid)) &&
 	    !capable(CAP_CHOWN))
-		goto error;
+		return -EPERM;
 
 	/* Make sure a caller can chmod. */
 	if (ia_valid & ATTR_MODE) {
 		if (!is_owner_or_cap(inode))
-			goto error;
+			return -EPERM;
 		/* Also check the setgid bit! */
 		if (!in_group_p((ia_valid & ATTR_GID) ? attr->ia_gid :
 				inode->i_gid) && !capable(CAP_FSETID))
@@ -52,12 +70,10 @@ int inode_change_ok(const struct inode *inode, struct iattr *attr)
 	/* Check for setting the inode time. */
 	if (ia_valid & (ATTR_MTIME_SET | ATTR_ATIME_SET | ATTR_TIMES_SET)) {
 		if (!is_owner_or_cap(inode))
-			goto error;
+			return -EPERM;
 	}
-fine:
-	retval = 0;
-error:
-	return retval;
+
+	return 0;
 }
 EXPORT_SYMBOL(inode_change_ok);
 
@@ -113,7 +129,7 @@ EXPORT_SYMBOL(inode_newsize_ok);
  *
  * setattr_copy updates the inode's metadata with that specified
  * in attr. Noticably missing is inode size update, which is more complex
- * as it requires pagecache updates. See simple_setsize.
+ * as it requires pagecache updates.
  *
  * The inode is not marked as dirty after this operation. The rationale is
  * that for "simple" filesystems, the struct inode is the inode storage.

fs/ecryptfs/inode.c

@@ -804,10 +804,20 @@ static int truncate_upper(struct dentry *dentry, struct iattr *ia,
 		size_t num_zeros = (PAGE_CACHE_SIZE
 				    - (ia->ia_size & ~PAGE_CACHE_MASK));
 
+
+		/*
+		 * XXX(truncate) this should really happen at the begginning
+		 * of ->setattr.  But the code is too messy to that as part
+		 * of a larger patch.  ecryptfs is also totally missing out
+		 * on the inode_change_ok check at the beginning of
+		 * ->setattr while would include this.
+		 */
+		rc = inode_newsize_ok(inode, ia->ia_size);
+		if (rc)
+			goto out;
+
 		if (!(crypt_stat->flags & ECRYPTFS_ENCRYPTED)) {
-			rc = simple_setsize(inode, ia->ia_size);
-			if (rc)
-				goto out;
+			truncate_setsize(inode, ia->ia_size);
 			lower_ia->ia_size = ia->ia_size;
 			lower_ia->ia_valid |= ATTR_SIZE;
 			goto out;
@@ -830,7 +840,7 @@ static int truncate_upper(struct dentry *dentry, struct iattr *ia,
 				goto out;
 			}
 		}
-		simple_setsize(inode, ia->ia_size);
+		truncate_setsize(inode, ia->ia_size);
 		rc = ecryptfs_write_inode_size_to_metadata(inode);
 		if (rc) {
 			printk(KERN_ERR	"Problem with "

fs/ext2/inode.c

@@ -1156,15 +1156,10 @@ static void ext2_truncate_blocks(struct inode *inode, loff_t offset)
 	__ext2_truncate_blocks(inode, offset);
 }
 
-int ext2_setsize(struct inode *inode, loff_t newsize)
+static int ext2_setsize(struct inode *inode, loff_t newsize)
 {
-	loff_t oldsize;
 	int error;
 
-	error = inode_newsize_ok(inode, newsize);
-	if (error)
-		return error;
-
 	if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
 	    S_ISLNK(inode->i_mode)))
 		return -EINVAL;
@@ -1184,10 +1179,7 @@ int ext2_setsize(struct inode *inode, loff_t newsize)
 	if (error)
 		return error;
 
-	oldsize = inode->i_size;
-	i_size_write(inode, newsize);
-	truncate_pagecache(inode, oldsize, newsize);
-
+	truncate_setsize(inode, newsize);
 	__ext2_truncate_blocks(inode, newsize);
 
 	inode->i_mtime = inode->i_ctime = CURRENT_TIME_SEC;

fs/fat/fat.h

@@ -306,7 +306,6 @@ extern long fat_generic_ioctl(struct file *filp, unsigned int cmd,
 extern const struct file_operations fat_file_operations;
 extern const struct inode_operations fat_file_inode_operations;
 extern int fat_setattr(struct dentry * dentry, struct iattr * attr);
-extern int fat_setsize(struct inode *inode, loff_t offset);
 extern void fat_truncate_blocks(struct inode *inode, loff_t offset);
 extern int fat_getattr(struct vfsmount *mnt, struct dentry *dentry,
 		       struct kstat *stat);

fs/fat/file.c

@@ -364,18 +364,6 @@ static int fat_allow_set_time(struct msdos_sb_info *sbi, struct inode *inode)
 	return 0;
 }
 
-int fat_setsize(struct inode *inode, loff_t offset)
-{
-	int error;
-
-	error = simple_setsize(inode, offset);
-	if (error)
-		return error;
-	fat_truncate_blocks(inode, offset);
-
-	return error;
-}
-
 #define TIMES_SET_FLAGS	(ATTR_MTIME_SET | ATTR_ATIME_SET | ATTR_TIMES_SET)
 /* valid file mode bits */
 #define FAT_VALID_MODE	(S_IFREG | S_IFDIR | S_IRWXUGO)
@@ -441,9 +429,8 @@ int fat_setattr(struct dentry *dentry, struct iattr *attr)
 	}
 
 	if (attr->ia_valid & ATTR_SIZE) {
-		error = fat_setsize(inode, attr->ia_size);
-		if (error)
-			goto out;
+		truncate_setsize(inode, attr->ia_size);
+		fat_truncate_blocks(inode, attr->ia_size);
 	}
 
 	setattr_copy(inode, attr);

fs/fuse/dir.c

@@ -1280,12 +1280,8 @@ static int fuse_do_setattr(struct dentry *entry, struct iattr *attr,
 	if ((attr->ia_valid & ATTR_OPEN) && fc->atomic_o_trunc)
 		return 0;
 
-	if (attr->ia_valid & ATTR_SIZE) {
-		err = inode_newsize_ok(inode, attr->ia_size);
-		if (err)
-			return err;
+	if (attr->ia_valid & ATTR_SIZE)
 		is_truncate = true;
-	}
 
 	req = fuse_get_req(fc);
 	if (IS_ERR(req))

fs/gfs2/aops.c

@@ -702,12 +702,12 @@ static int gfs2_write_begin(struct file *file, struct address_space *mapping,
 	page_cache_release(page);
 
 	/*
-	 * XXX(hch): the call below should probably be replaced with
+	 * XXX(truncate): the call below should probably be replaced with
 	 * a call to the gfs2-specific truncate blocks helper to actually
 	 * release disk blocks..
 	 */
 	if (pos + len > ip->i_inode.i_size)
-		simple_setsize(&ip->i_inode, ip->i_inode.i_size);
+		truncate_setsize(&ip->i_inode, ip->i_inode.i_size);
 out_endtrans:
 	gfs2_trans_end(sdp);
 out_trans_fail:

fs/gfs2/ops_inode.c

@@ -1072,7 +1072,7 @@ int gfs2_permission(struct inode *inode, int mask)
 }
 
 /*
- * XXX: should be changed to have proper ordering by opencoding simple_setsize
+ * XXX(truncate): the truncate_setsize calls should be moved to the end.
  */
 static int setattr_size(struct inode *inode, struct iattr *attr)
 {
@@ -1084,10 +1084,8 @@ static int setattr_size(struct inode *inode, struct iattr *attr)
 		error = gfs2_trans_begin(sdp, 0, sdp->sd_jdesc->jd_blocks);
 		if (error)
 			return error;
-		error = simple_setsize(inode, attr->ia_size);
+		truncate_setsize(inode, attr->ia_size);
 		gfs2_trans_end(sdp);
-		if (error) 
-			return error;
 	}
 
 	error = gfs2_truncatei(ip, attr->ia_size);

fs/jffs2/fs.c

@@ -169,13 +169,13 @@ int jffs2_do_setattr (struct inode *inode, struct iattr *iattr)
 	mutex_unlock(&f->sem);
 	jffs2_complete_reservation(c);
 
-	/* We have to do the simple_setsize() without f->sem held, since
+	/* We have to do the truncate_setsize() without f->sem held, since
 	   some pages may be locked and waiting for it in readpage().
 	   We are protected from a simultaneous write() extending i_size
 	   back past iattr->ia_size, because do_truncate() holds the
 	   generic inode semaphore. */
 	if (ivalid & ATTR_SIZE && inode->i_size > iattr->ia_size) {
-		simple_setsize(inode, iattr->ia_size);
+		truncate_setsize(inode, iattr->ia_size);
 		inode->i_blocks = (inode->i_size + 511) >> 9;
 	}	
 

fs/libfs.c

@@ -326,49 +326,6 @@ int simple_rename(struct inode *old_dir, struct dentry *old_dentry,
 	return 0;
 }
 
-/**
- * simple_setsize - handle core mm and vfs requirements for file size change
- * @inode: inode
- * @newsize: new file size
- *
- * Returns 0 on success, -error on failure.
- *
- * simple_setsize must be called with inode_mutex held.
- *
- * simple_setsize will check that the requested new size is OK (see
- * inode_newsize_ok), and then will perform the necessary i_size update
- * and pagecache truncation (if necessary). It will be typically be called
- * from the filesystem's setattr function when ATTR_SIZE is passed in.
- *
- * The inode itself must have correct permissions and attributes to allow
- * i_size to be changed, this function then just checks that the new size
- * requested is valid.
- *
- * In the case of simple in-memory filesystems with inodes stored solely
- * in the inode cache, and file data in the pagecache, nothing more needs
- * to be done to satisfy a truncate request. Filesystems with on-disk
- * blocks for example will need to free them in the case of truncate, in
- * that case it may be easier not to use simple_setsize (but each of its
- * components will likely be required at some point to update pagecache
- * and inode etc).
- */
-int simple_setsize(struct inode *inode, loff_t newsize)
-{
-	loff_t oldsize;
-	int error;
-
-	error = inode_newsize_ok(inode, newsize);
-	if (error)
-		return error;
-
-	oldsize = inode->i_size;
-	i_size_write(inode, newsize);
-	truncate_pagecache(inode, oldsize, newsize);
-
-	return error;
-}
-EXPORT_SYMBOL(simple_setsize);
-
 /**
  * simple_setattr - setattr for simple filesystem
  * @dentry: dentry
@@ -394,12 +351,8 @@ int simple_setattr(struct dentry *dentry, struct iattr *iattr)
 	if (error)
 		return error;
 
-	if (iattr->ia_valid & ATTR_SIZE) {
-		error = simple_setsize(inode, iattr->ia_size);
-		if (error)
-			return error;
-	}
-
+	if (iattr->ia_valid & ATTR_SIZE)
+		truncate_setsize(inode, iattr->ia_size);
 	setattr_copy(inode, iattr);
 	mark_inode_dirty(inode);
 	return 0;

fs/ocfs2/file.c

@@ -1233,7 +1233,7 @@ int ocfs2_setattr(struct dentry *dentry, struct iattr *attr)
 	}
 
 	/*
-	 * This will intentionally not wind up calling simple_setsize(),
+	 * This will intentionally not wind up calling truncate_setsize(),
 	 * since all the work for a size change has been done above.
 	 * Otherwise, we could get into problems with truncate as
 	 * ip_alloc_sem is used there to protect against i_size
@@ -2308,12 +2308,12 @@ static ssize_t ocfs2_file_aio_write(struct kiocb *iocb,
 			 * blocks outside i_size. Trim these off again.
 			 * Don't need i_size_read because we hold i_mutex.
 			 *
-			 * XXX(hch): this looks buggy because ocfs2 did not
+			 * XXX(truncate): this looks buggy because ocfs2 did not
 			 * actually implement ->truncate.  Take a look at
 			 * the new truncate sequence and update this accordingly
 			 */
 			if (*ppos + count > inode->i_size)
-				simple_setsize(inode, inode->i_size);
+				truncate_setsize(inode, inode->i_size);
 			ret = written;
 			goto out_dio;
 		}

fs/ramfs/file-nommu.c

@@ -146,9 +146,8 @@ static int ramfs_nommu_resize(struct inode *inode, loff_t newsize, loff_t size)
 			return ret;
 	}
 
-	ret = simple_setsize(inode, newsize);
-
-	return ret;
+	truncate_setsize(inode, newsize);
+	return 0;
 }
 
 /*****************************************************************************/

fs/smbfs/inode.c

@@ -714,9 +714,7 @@ smb_notify_change(struct dentry *dentry, struct iattr *attr)
 		error = server->ops->truncate(inode, attr->ia_size);
 		if (error)
 			goto out;
-		error = simple_setsize(inode, attr->ia_size);
-		if (error)
-			goto out;
+		truncate_setsize(inode, attr->ia_size);
 		refresh = 1;
 	}