From eef2380c187890816b73b1a4cb89a09203759469 Mon Sep 17 00:00:00 2001 From: Christoph Hellwig Date: Fri, 4 Jun 2010 11:30:01 +0200 Subject: [PATCH] default to simple_setattr With the new truncate sequence every filesystem that wants to support file size changes on disk needs to implement its own ->setattr. So instead of calling inode_setattr which supports size changes call into a simple method that doesn't support this. simple_setattr is almost what we want except that it does not mark the inode dirty after changes. Given that marking the inode dirty is a no-op for the simple in-memory filesystems that use simple_setattr currently just add the mark_inode_dirty call. Also add a WARN_ON for the presence of a truncate method to simple_setattr to catch new instances of it during the transition period. Signed-off-by: Christoph Hellwig Signed-off-by: Al Viro --- fs/attr.c | 9 +++------ fs/libfs.c | 16 +++++++++++----- 2 files changed, 14 insertions(+), 11 deletions(-) diff --git a/fs/attr.c b/fs/attr.c index 1f6a895e24e9..aeac826f4774 100644 --- a/fs/attr.c +++ b/fs/attr.c @@ -237,13 +237,10 @@ int notify_change(struct dentry * dentry, struct iattr * attr) if (ia_valid & ATTR_SIZE) down_write(&dentry->d_inode->i_alloc_sem); - if (inode->i_op && inode->i_op->setattr) { + if (inode->i_op->setattr) error = inode->i_op->setattr(dentry, attr); - } else { - error = inode_change_ok(inode, attr); - if (!error) - error = inode_setattr(inode, attr); - } + else + error = simple_setattr(dentry, attr); if (ia_valid & ATTR_SIZE) up_write(&dentry->d_inode->i_alloc_sem); diff --git a/fs/libfs.c b/fs/libfs.c index 861a88797716..40562224b718 100644 --- a/fs/libfs.c +++ b/fs/libfs.c @@ -370,21 +370,26 @@ int simple_setsize(struct inode *inode, loff_t newsize) EXPORT_SYMBOL(simple_setsize); /** - * simple_setattr - setattr for simple in-memory filesystem + * simple_setattr - setattr for simple filesystem * @dentry: dentry * @iattr: iattr structure * * Returns 0 on success, -error on failure. * - * simple_setattr implements setattr for an in-memory filesystem which - * does not store its own file data or metadata (eg. uses the page cache - * and inode cache as its data store). + * simple_setattr is a simple ->setattr implementation without a proper + * implementation of size changes. + * + * It can either be used for in-memory filesystems or special files + * on simple regular filesystems. Anything that needs to change on-disk + * or wire state on size changes needs its own setattr method. */ int simple_setattr(struct dentry *dentry, struct iattr *iattr) { struct inode *inode = dentry->d_inode; int error; + WARN_ON_ONCE(inode->i_op->truncate); + error = inode_change_ok(inode, iattr); if (error) return error; @@ -396,7 +401,8 @@ int simple_setattr(struct dentry *dentry, struct iattr *iattr) } setattr_copy(inode, iattr); - return error; + mark_inode_dirty(inode); + return 0; } EXPORT_SYMBOL(simple_setattr); -- 2.39.5