/* * 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; }