From 1b9474635e21eef0f3e69fd1c7b1b9598ffdddd3 Mon Sep 17 00:00:00 2001 From: Christoph Hellwig Date: Sun, 18 Jul 2010 17:51:21 -0400 Subject: [PATCH] cifs: truncate fallout Remove the calls to inode_newsize_ok given that we already did it as part of inode_change_ok in the beginning of cifs_setattr_(no)unix. No need to call ->truncate if cifs doesn't have one, so remove the explicit call in cifs_vmtruncate, and replace the calls to vmtruncate with truncate_setsize which is vmtruncate minus inode_newsize_ok and the call to ->truncate. Rename cifs_vmtruncate to cifs_setsize to match the new calling conventions. Question 1: why does cifs do the pagecache munging and i_size update twice for each setattr call, once opencoded in cifs_vmtruncate, and once using the VFS helpers? Question 2: what is supposed to be protected by i_lock in cifs_vmtruncate? Do we need it around the call to inode_change_ok? [AV: fixed build breakage] Signed-off-by: Christoph Hellwig Signed-off-by: Al Viro --- fs/cifs/inode.c | 30 +++++++----------------------- 1 file changed, 7 insertions(+), 23 deletions(-) diff --git a/fs/cifs/inode.c b/fs/cifs/inode.c index b95f4a5af013..ddbe8a84c51d 100644 --- a/fs/cifs/inode.c +++ b/fs/cifs/inode.c @@ -1679,26 +1679,16 @@ static int cifs_truncate_page(struct address_space *mapping, loff_t from) return rc; } -static int cifs_vmtruncate(struct inode *inode, loff_t offset) +static void cifs_setsize(struct inode *inode, loff_t offset) { loff_t oldsize; - int err; spin_lock(&inode->i_lock); - err = inode_newsize_ok(inode, offset); - if (err) { - spin_unlock(&inode->i_lock); - goto out; - } - oldsize = inode->i_size; i_size_write(inode, offset); spin_unlock(&inode->i_lock); + truncate_pagecache(inode, oldsize, offset); - if (inode->i_op->truncate) - inode->i_op->truncate(inode); -out: - return err; } static int @@ -1771,7 +1761,7 @@ cifs_set_file_size(struct inode *inode, struct iattr *attrs, if (rc == 0) { cifsInode->server_eof = attrs->ia_size; - rc = cifs_vmtruncate(inode, attrs->ia_size); + cifs_setsize(inode, attrs->ia_size); cifs_truncate_page(inode->i_mapping, inode->i_size); } @@ -1891,11 +1881,8 @@ cifs_setattr_unix(struct dentry *direntry, struct iattr *attrs) goto out; if ((attrs->ia_valid & ATTR_SIZE) && - attrs->ia_size != i_size_read(inode)) { - rc = vmtruncate(inode, attrs->ia_size); - if (rc) - goto out; - } + attrs->ia_size != i_size_read(inode)) + truncate_setsize(inode, attrs->ia_size); setattr_copy(inode, attrs); mark_inode_dirty(inode); @@ -2050,11 +2037,8 @@ cifs_setattr_nounix(struct dentry *direntry, struct iattr *attrs) goto cifs_setattr_exit; if ((attrs->ia_valid & ATTR_SIZE) && - attrs->ia_size != i_size_read(inode)) { - rc = vmtruncate(inode, attrs->ia_size); - if (rc) - goto cifs_setattr_exit; - } + attrs->ia_size != i_size_read(inode)) + truncate_setsize(inode, attrs->ia_size); setattr_copy(inode, attrs); mark_inode_dirty(inode);