On Thu, 1 Mar 2001, Peter Daum wrote:
> In that case, why was it changed for FAT only? Ext2 will still
> happily enlarge a file by truncating it.
Basically, the program depends on behaviour that was never guaranteed to
be there.
> Staroffice (the binary-only version; the new "open source"
> version is not yet ready for real-world use) for example
> currently doesn't write to FAT filesystems anymore - which is
> pretty annoying for people who need it.
Staroffice is non-portable and badly written, film at 11...
BTW, _some_ subset is doable on FAT. You can't always do it (bloody
thing doesn't support holes), but you can try the following (warning -
untested patch):
diff -urN S2/fs/fat/inode.c S2-fat/fs/fat/inode.c
--- S2/fs/fat/inode.c Fri Feb 16 22:52:07 2001
+++ S2-fat/fs/fat/inode.c Thu Mar 1 10:02:45 2001
@@ -897,6 +897,36 @@
unlock_kernel();
}
+int generic_cont_expand(struct inode *inode, loff_t size)
+{
+ struct address_space *mapping = inode->i_mapping;
+ struct page *page;
+ unsigned long index, offset, limit;
+ int err;
+
+ limit = current->rlim[RLIMIT_FSIZE].rlim_cur;
+ if (limit != RLIM_INFINITY) {
+ if (size > limit) {
+ send_sig(SIGXFSZ, current, 0);
+ size = limit;
+ }
+ }
+ offset = (size & (PAGE_CACHE_SIZE-1)); /* Within page */
+ index = size >> PAGE_CACHE_SHIFT;
+ err = -ENOMEM;
+ page = grab_cache_page(mapping, index);
+ if (!page)
+ goto out;
+ err = mapping->a_ops->prepare_write(NULL, page, offset, offset);
+ if (!err)
+ err = mapping->a_ops->commit_write(NULL, page, offset, offset);
+ UnlockPage(page);
+ page_cache_release(page);
+ if (err > 0)
+ err = 0;
+out:
+ return err;
+}
int fat_notify_change(struct dentry * dentry, struct iattr * attr)
{
@@ -904,11 +934,17 @@
struct inode *inode = dentry->d_inode;
- int error;
+ int error = 0;
- /* FAT cannot truncate to a longer file */
+ /*
+ * On FAT truncate to a longer file may fail with -ENOSPC. No
+ * way to report it from fat_truncate(), so...
+ */
if (attr->ia_valid & ATTR_SIZE) {
if (attr->ia_size > inode->i_size)
- return -EPERM;
+ error = generic_cont_expand(inode, attr->ia_size);
}
+
+ if (error)
+ return error;
error = inode_change_ok(inode, attr);
if (error)
That said, if your only problem is Staroffice... <shrug> I would rather
rm the crapware and forget about it, but YMMV.
Cheers,
Al
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