diff options
Diffstat (limited to 'fs/udf/file.c')
| -rw-r--r-- | fs/udf/file.c | 61 |
1 files changed, 60 insertions, 1 deletions
diff --git a/fs/udf/file.c b/fs/udf/file.c index cf050bdffd9e..322115c8369d 100644 --- a/fs/udf/file.c +++ b/fs/udf/file.c @@ -134,6 +134,57 @@ const struct address_space_operations udf_adinicb_aops = { .direct_IO = udf_adinicb_direct_IO, }; +static vm_fault_t udf_page_mkwrite(struct vm_fault *vmf) +{ + struct vm_area_struct *vma = vmf->vma; + struct inode *inode = file_inode(vma->vm_file); + struct address_space *mapping = inode->i_mapping; + struct page *page = vmf->page; + loff_t size; + unsigned int end; + vm_fault_t ret = VM_FAULT_LOCKED; + int err; + + sb_start_pagefault(inode->i_sb); + file_update_time(vma->vm_file); + filemap_invalidate_lock_shared(mapping); + lock_page(page); + size = i_size_read(inode); + if (page->mapping != inode->i_mapping || page_offset(page) >= size) { + unlock_page(page); + ret = VM_FAULT_NOPAGE; + goto out_unlock; + } + /* Space is already allocated for in-ICB file */ + if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) + goto out_dirty; + if (page->index == size >> PAGE_SHIFT) + end = size & ~PAGE_MASK; + else + end = PAGE_SIZE; + err = __block_write_begin(page, 0, end, udf_get_block); + if (!err) + err = block_commit_write(page, 0, end); + if (err < 0) { + unlock_page(page); + ret = block_page_mkwrite_return(err); + goto out_unlock; + } +out_dirty: + set_page_dirty(page); + wait_for_stable_page(page); +out_unlock: + filemap_invalidate_unlock_shared(mapping); + sb_end_pagefault(inode->i_sb); + return ret; +} + +static const struct vm_operations_struct udf_file_vm_ops = { + .fault = filemap_fault, + .map_pages = filemap_map_pages, + .page_mkwrite = udf_page_mkwrite, +}; + static ssize_t udf_file_write_iter(struct kiocb *iocb, struct iov_iter *from) { ssize_t retval; @@ -238,11 +289,19 @@ static int udf_release_file(struct inode *inode, struct file *filp) return 0; } +static int udf_file_mmap(struct file *file, struct vm_area_struct *vma) +{ + file_accessed(file); + vma->vm_ops = &udf_file_vm_ops; + + return 0; +} + const struct file_operations udf_file_operations = { .read_iter = generic_file_read_iter, .unlocked_ioctl = udf_ioctl, .open = generic_file_open, - .mmap = generic_file_mmap, + .mmap = udf_file_mmap, .write_iter = udf_file_write_iter, .release = udf_release_file, .fsync = generic_file_fsync, |