/*
* Handle all mappings that got truncated by a "truncate()"
* system call.
*
* NOTE! We have to be ready to update the memory sharing
* between the file and the memory map for a potential last
* incomplete page. Ugly, but necessary.
*/
void vmtruncate(struct inode * inode, loff_t offset)
{
unsigned long partial, pgoff;
struct address_space *mapping = inode->i_mapping;
unsigned long limit;
if (inode->i_size < offset)
goto do_expand;
inode->i_size = offset;
truncate_inode_pages(mapping, offset);
spin_lock(&mapping->i_shared_lock);
if (!mapping->i_mmap && !mapping->i_mmap_shared)
goto out_unlock;
pgoff = (offset + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
partial = (unsigned long)offset & (PAGE_CACHE_SIZE - 1);
if (mapping->i_mmap != NULL)
vmtruncate_list(mapping->i_mmap, pgoff, partial);
if (mapping->i_mmap_shared != NULL)
vmtruncate_list(mapping->i_mmap_shared, pgoff, partial);
out_unlock:
spin_unlock(&mapping->i_shared_lock);
/* this should go into ->truncate */
inode->i_size = offset;
if (inode->i_op && inode->i_op->truncate)
inode->i_op->truncate(inode);
return;
do_expand:
limit = current->rlim[RLIMIT_FSIZE].rlim_cur;
if (limit != RLIM_INFINITY) {
if (inode->i_size >= limit) {
send_sig(SIGXFSZ, current, 0);
goto out;
}
if (offset > limit) {
send_sig(SIGXFSZ, current, 0);
offset = limit;
}
}
inode->i_size = offset;
if (inode->i_op && inode->i_op->truncate)
inode->i_op->truncate(inode);
out:
return;
}
/*
* Handle all mappings that got truncated by a "truncate()"
* system call.
*
* NOTE! We have to be ready to update the memory sharing
* between the file and the memory map for a potential last
* incomplete page. Ugly, but necessary.
*/
int vmtruncate(struct inode * inode, loff_t offset)
{
unsigned long pgoff;
struct address_space *mapping = inode->i_mapping;
unsigned long limit;
if (inode->i_size < offset)
goto do_expand;
inode->i_size = offset;
spin_lock(&mapping->i_shared_lock);
if (!mapping->i_mmap && !mapping->i_mmap_shared)
goto out_unlock;
pgoff = (offset + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
if (mapping->i_mmap != NULL)
vmtruncate_list(mapping->i_mmap, pgoff);
if (mapping->i_mmap_shared != NULL)
vmtruncate_list(mapping->i_mmap_shared, pgoff);
out_unlock:
spin_unlock(&mapping->i_shared_lock);
truncate_inode_pages(mapping, offset);
goto out_truncate;
do_expand:
limit = current->rlim[RLIMIT_FSIZE].rlim_cur;
if (limit != RLIM_INFINITY) {
if (inode->i_size >= limit) {
send_sig(SIGXFSZ, current, 0);
goto out;
}
if (offset > limit) {
send_sig(SIGXFSZ, current, 0);
offset = limit;
}
}
inode->i_size = offset;
out_truncate:
if (inode->i_op && inode->i_op->truncate) {
lock_kernel();
inode->i_op->truncate(inode);
unlock_kernel();
}
out:
return 0;
}
