Messages in this thread | | | Date | Fri, 26 Feb 2010 16:11:31 -0800 | From | Sunil Mushran <> | Subject | Re: [Ocfs2-devel] [PATCH 09/11] ocfs2_dlmfs: Don't honor truncate. The size of a dlmfs file is LVB_LEN |
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Signed-off-by: Sunil Mushran <sunil.mushran@oracle.com>
Joel Becker wrote: > We want folks using dlmfs to be able to use the LVB in places other than > just write(2)/read(2). By ignoring truncate requests, we allow 'echo > "contents" > /dlm/space/lockname' to work. > > Signed-off-by: Joel Becker <joel.becker@oracle.com> > --- > fs/ocfs2/dlmfs/dlmfs.c | 18 ++++++++++++++++++ > 1 files changed, 18 insertions(+), 0 deletions(-) > > diff --git a/fs/ocfs2/dlmfs/dlmfs.c b/fs/ocfs2/dlmfs/dlmfs.c > index e21ce0e..13ac2bf 100644 > --- a/fs/ocfs2/dlmfs/dlmfs.c > +++ b/fs/ocfs2/dlmfs/dlmfs.c > @@ -220,6 +220,23 @@ static int dlmfs_file_release(struct inode *inode, > return 0; > } > > +/* > + * We do ->setattr() just to override size changes. Our size is the size > + * of the LVB and nothing else. > + */ > +static int dlmfs_file_setattr(struct dentry *dentry, struct iattr *attr) > +{ > + int error; > + struct inode *inode = dentry->d_inode; > + > + attr->ia_valid &= ~ATTR_SIZE; > + error = inode_change_ok(inode, attr); > + if (!error) > + error = inode_setattr(inode, attr); > + > + return error; > +} > + > static unsigned int dlmfs_file_poll(struct file *file, poll_table *wait) > { > int event = 0; > @@ -634,6 +651,7 @@ static const struct super_operations dlmfs_ops = { > > static const struct inode_operations dlmfs_file_inode_operations = { > .getattr = simple_getattr, > + .setattr = dlmfs_file_setattr, > }; > > static int dlmfs_get_sb(struct file_system_type *fs_type, >
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