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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 <hch@lst.de>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Christoph Hellwig 2010-07-18 17:51:21 -04:00 committed by Al Viro
parent e566d48c9b
commit 1b9474635e
1 changed files with 7 additions and 23 deletions
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30
fs/cifs/inode.c
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@ -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);