3  *  linux/fs/nfs/file.c
13  *  Expire cache on write to a file by Wai S Kok (Oct 1994).
17  *  nfs regular file handling functions
60  * Open file
63 nfs_file_open(struct inode *inode, struct file *filp)  in nfs_file_open()
67 	dprintk("NFS: open file(%pD2)\n", filp);  in nfs_file_open()
81 nfs_file_release(struct inode *inode, struct file *filp)  in nfs_file_release()
93  * nfs_revalidate_file_size - Revalidate the file size
95  * @filp: pointer to struct file
97  * Revalidates the file length. This is basically a wrapper around
100  * idea of what the file length is), or O_DIRECT (in which case we
103 static int nfs_revalidate_file_size(struct inode *inode, struct file *filp)  in nfs_revalidate_file_size()
116 loff_t nfs_file_llseek(struct file *filp, loff_t offset, int whence)  in nfs_file_llseek()
118 	dprintk("NFS: llseek file(%pD2, %lld, %d)\n",  in nfs_file_llseek()
123 	 * the cached file length  in nfs_file_llseek()
141 nfs_file_flush(struct file *file, fl_owner_t id)  in nfs_file_flush()  argument
143 	struct inode	*inode = file_inode(file);  in nfs_file_flush()
146 	dprintk("NFS: flush(%pD2)\n", file);  in nfs_file_flush()
149 	if ((file->f_mode & FMODE_WRITE) == 0)  in nfs_file_flush()
153 	since = filemap_sample_wb_err(file->f_mapping);  in nfs_file_flush()
155 	return filemap_check_wb_err(file->f_mapping, since);  in nfs_file_flush()
189 nfs_file_splice_read(struct file *in, loff_t *ppos, struct pipe_inode_info *pipe,  in nfs_file_splice_read()
215 	struct file *file = desc->file;  in nfs_file_mmap_prepare()  local
216 	struct inode *inode = file_inode(file);  in nfs_file_mmap_prepare()
219 	dprintk("NFS: mmap(%pD2)\n", file);  in nfs_file_mmap_prepare()
227 		status = nfs_revalidate_mapping(inode, file->f_mapping);  in nfs_file_mmap_prepare()
239 nfs_file_fsync_commit(struct file *file, int datasync)  in nfs_file_fsync_commit()  argument
241 	struct inode *inode = file_inode(file);  in nfs_file_fsync_commit()
244 	dprintk("NFS: fsync file(%pD2) datasync %d\n", file, datasync);  in nfs_file_fsync_commit()
248 	ret2 = file_check_and_advance_wb_err(file);  in nfs_file_fsync_commit()
255 nfs_file_fsync(struct file *file, loff_t start, loff_t end, int datasync)  in nfs_file_fsync()  argument
257 	struct inode *inode = file_inode(file);  in nfs_file_fsync()
266 		ret = file_write_and_wait_range(file, start, end);  in nfs_file_fsync()
269 		ret = nfs_file_fsync_commit(file, datasync);  in nfs_file_fsync()
335  * It may be more efficient to read the page first if the file is
339  * that there were valid bytes of data in that range of the file,
341  * that range of the file.
353 static bool nfs_want_read_modify_write(struct file *file, struct folio *folio,  in nfs_want_read_modify_write()  argument
364 	if (pnfs_ld_read_whole_page(file_inode(file)))  in nfs_want_read_modify_write()
369 	if (file->f_mode & FMODE_READ)  in nfs_want_read_modify_write()
388 	struct file *file = iocb->ki_filp;  in nfs_write_begin()  local
392 	trace_nfs_write_begin(file_inode(file), pos, len);  in nfs_write_begin()
395 		file, mapping->host->i_ino, len, (long long) pos);  in nfs_write_begin()
406 	ret = nfs_flush_incompatible(file, folio);  in nfs_write_begin()
411 		   nfs_want_read_modify_write(file, folio, pos, len)) {  in nfs_write_begin()
414 		ret = nfs_read_folio(file, folio);  in nfs_write_begin()
420 	trace_nfs_write_begin_done(file_inode(file), pos, len, ret);  in nfs_write_begin()
429 	struct file *file = iocb->ki_filp;  in nfs_write_end()  local
430 	struct nfs_open_context *ctx = nfs_file_open_context(file);  in nfs_write_end()
434 	trace_nfs_write_end(file_inode(file), pos, len);  in nfs_write_end()
436 		file, mapping->host->i_ino, len, (long long) pos);  in nfs_write_end()
440 	 * as up to date if it turns out that we're extending the file.  in nfs_write_end()
458 	status = nfs_update_folio(file, folio, offset, copied);  in nfs_write_end()
464 		trace_nfs_write_end_done(file_inode(file), pos, len, status);  in nfs_write_end()
472 	trace_nfs_write_end_done(file_inode(file), pos, len, copied);  in nfs_write_end()
570 static int nfs_swap_activate(struct swap_info_struct *sis, struct file *file,  in nfs_swap_activate()  argument
576 	struct inode *inode = file_inode(file);  in nfs_swap_activate()
607 static void nfs_swap_deactivate(struct file *file)  in nfs_swap_deactivate()  argument
609 	struct inode *inode = file_inode(file);  in nfs_swap_deactivate()
615 		cl->rpc_ops->disable_swap(file_inode(file));  in nfs_swap_deactivate()
643 	struct file *filp = vmf->vma->vm_file;  in nfs_vm_page_mkwrite()
699 	struct file *file = iocb->ki_filp;  in nfs_file_write()  local
700 	struct inode *inode = file_inode(file);  in nfs_file_write()
708 	result = nfs_key_timeout_notify(file, inode);  in nfs_file_write()
716 		file, iov_iter_count(from), (long long) iocb->ki_pos);  in nfs_file_write()
721 	 * O_APPEND implies that we must revalidate the file length.  in nfs_file_write()
724 		result = nfs_revalidate_file_size(inode, file);  in nfs_file_write()
729 	nfs_clear_invalid_mapping(file->f_mapping);  in nfs_file_write()
731 	since = filemap_sample_wb_err(file->f_mapping);  in nfs_file_write()
746 		result = filemap_fdatawrite_range(file->f_mapping,  in nfs_file_write()
753 		filemap_fdatawait_range(file->f_mapping,  in nfs_file_write()
763 	error = filemap_check_wb_err(file->f_mapping, since);  in nfs_file_write()
771 		error = file_check_and_advance_wb_err(file);  in nfs_file_write()
778 	printk(KERN_INFO "NFS: attempt to write to active swap file!\n");  in nfs_file_write()
784 do_getlk(struct file *filp, int cmd, struct file_lock *fl, int is_local)  in do_getlk()
813 do_unlk(struct file *filp, int cmd, struct file_lock *fl, int is_local)  in do_unlk()
849 do_setlk(struct file *filp, int cmd, struct file_lock *fl, int is_local)  in do_setlk()
875 	 * the file is mapped, clear the page cache as well so  in do_setlk()
891  * Lock a (portion of) a file
893 int nfs_lock(struct file *filp, int cmd, struct file_lock *fl)  in nfs_lock()
929  * Lock a (portion of) a file
931 int nfs_flock(struct file *filp, int cmd, struct file_lock *fl)  in nfs_flock()