Adding upstream version 5.10.209.upstream/5.10.209

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1126 insertions, 0 deletions

diff --git a/fs/orangefs/inode.c b/fs/orangefs/inode.c
new file mode 100644
index 000000000..48f0547d4
--- /dev/null
+++ b/fs/orangefs/inode.c
@@ -0,0 +1,1126 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * (C) 2001 Clemson University and The University of Chicago
+ * Copyright 2018 Omnibond Systems, L.L.C.
+ *
+ * See COPYING in top-level directory.
+ */
+
+/*
+ *  Linux VFS inode operations.
+ */
+
+#include <linux/bvec.h>
+#include "protocol.h"
+#include "orangefs-kernel.h"
+#include "orangefs-bufmap.h"
+
+static int orangefs_writepage_locked(struct page *page,
+    struct writeback_control *wbc)
+{
+	struct inode *inode = page->mapping->host;
+	struct orangefs_write_range *wr = NULL;
+	struct iov_iter iter;
+	struct bio_vec bv;
+	size_t len, wlen;
+	ssize_t ret;
+	loff_t off;
+
+	set_page_writeback(page);
+
+	len = i_size_read(inode);
+	if (PagePrivate(page)) {
+		wr = (struct orangefs_write_range *)page_private(page);
+		WARN_ON(wr->pos >= len);
+		off = wr->pos;
+		if (off + wr->len > len)
+			wlen = len - off;
+		else
+			wlen = wr->len;
+	} else {
+		WARN_ON(1);
+		off = page_offset(page);
+		if (off + PAGE_SIZE > len)
+			wlen = len - off;
+		else
+			wlen = PAGE_SIZE;
+	}
+	/* Should've been handled in orangefs_invalidatepage. */
+	WARN_ON(off == len || off + wlen > len);
+
+	bv.bv_page = page;
+	bv.bv_len = wlen;
+	bv.bv_offset = off % PAGE_SIZE;
+	WARN_ON(wlen == 0);
+	iov_iter_bvec(&iter, WRITE, &bv, 1, wlen);
+
+	ret = wait_for_direct_io(ORANGEFS_IO_WRITE, inode, &off, &iter, wlen,
+	    len, wr, NULL, NULL);
+	if (ret < 0) {
+		SetPageError(page);
+		mapping_set_error(page->mapping, ret);
+	} else {
+		ret = 0;
+	}
+	kfree(detach_page_private(page));
+	return ret;
+}
+
+static int orangefs_writepage(struct page *page, struct writeback_control *wbc)
+{
+	int ret;
+	ret = orangefs_writepage_locked(page, wbc);
+	unlock_page(page);
+	end_page_writeback(page);
+	return ret;
+}
+
+struct orangefs_writepages {
+	loff_t off;
+	size_t len;
+	kuid_t uid;
+	kgid_t gid;
+	int maxpages;
+	int npages;
+	struct page **pages;
+	struct bio_vec *bv;
+};
+
+static int orangefs_writepages_work(struct orangefs_writepages *ow,
+    struct writeback_control *wbc)
+{
+	struct inode *inode = ow->pages[0]->mapping->host;
+	struct orangefs_write_range *wrp, wr;
+	struct iov_iter iter;
+	ssize_t ret;
+	size_t len;
+	loff_t off;
+	int i;
+
+	len = i_size_read(inode);
+
+	for (i = 0; i < ow->npages; i++) {
+		set_page_writeback(ow->pages[i]);
+		ow->bv[i].bv_page = ow->pages[i];
+		ow->bv[i].bv_len = min(page_offset(ow->pages[i]) + PAGE_SIZE,
+		    ow->off + ow->len) -
+		    max(ow->off, page_offset(ow->pages[i]));
+		if (i == 0)
+			ow->bv[i].bv_offset = ow->off -
+			    page_offset(ow->pages[i]);
+		else
+			ow->bv[i].bv_offset = 0;
+	}
+	iov_iter_bvec(&iter, WRITE, ow->bv, ow->npages, ow->len);
+
+	WARN_ON(ow->off >= len);
+	if (ow->off + ow->len > len)
+		ow->len = len - ow->off;
+
+	off = ow->off;
+	wr.uid = ow->uid;
+	wr.gid = ow->gid;
+	ret = wait_for_direct_io(ORANGEFS_IO_WRITE, inode, &off, &iter, ow->len,
+	    0, &wr, NULL, NULL);
+	if (ret < 0) {
+		for (i = 0; i < ow->npages; i++) {
+			SetPageError(ow->pages[i]);
+			mapping_set_error(ow->pages[i]->mapping, ret);
+			if (PagePrivate(ow->pages[i])) {
+				wrp = (struct orangefs_write_range *)
+				    page_private(ow->pages[i]);
+				ClearPagePrivate(ow->pages[i]);
+				put_page(ow->pages[i]);
+				kfree(wrp);
+			}
+			end_page_writeback(ow->pages[i]);
+			unlock_page(ow->pages[i]);
+		}
+	} else {
+		ret = 0;
+		for (i = 0; i < ow->npages; i++) {
+			if (PagePrivate(ow->pages[i])) {
+				wrp = (struct orangefs_write_range *)
+				    page_private(ow->pages[i]);
+				ClearPagePrivate(ow->pages[i]);
+				put_page(ow->pages[i]);
+				kfree(wrp);
+			}
+			end_page_writeback(ow->pages[i]);
+			unlock_page(ow->pages[i]);
+		}
+	}
+	return ret;
+}
+
+static int orangefs_writepages_callback(struct page *page,
+    struct writeback_control *wbc, void *data)
+{
+	struct orangefs_writepages *ow = data;
+	struct orangefs_write_range *wr;
+	int ret;
+
+	if (!PagePrivate(page)) {
+		unlock_page(page);
+		/* It's not private so there's nothing to write, right? */
+		printk("writepages_callback not private!\n");
+		BUG();
+		return 0;
+	}
+	wr = (struct orangefs_write_range *)page_private(page);
+
+	ret = -1;
+	if (ow->npages == 0) {
+		ow->off = wr->pos;
+		ow->len = wr->len;
+		ow->uid = wr->uid;
+		ow->gid = wr->gid;
+		ow->pages[ow->npages++] = page;
+		ret = 0;
+		goto done;
+	}
+	if (!uid_eq(ow->uid, wr->uid) || !gid_eq(ow->gid, wr->gid)) {
+		orangefs_writepages_work(ow, wbc);
+		ow->npages = 0;
+		ret = -1;
+		goto done;
+	}
+	if (ow->off + ow->len == wr->pos) {
+		ow->len += wr->len;
+		ow->pages[ow->npages++] = page;
+		ret = 0;
+		goto done;
+	}
+done:
+	if (ret == -1) {
+		if (ow->npages) {
+			orangefs_writepages_work(ow, wbc);
+			ow->npages = 0;
+		}
+		ret = orangefs_writepage_locked(page, wbc);
+		mapping_set_error(page->mapping, ret);
+		unlock_page(page);
+		end_page_writeback(page);
+	} else {
+		if (ow->npages == ow->maxpages) {
+			orangefs_writepages_work(ow, wbc);
+			ow->npages = 0;
+		}
+	}
+	return ret;
+}
+
+static int orangefs_writepages(struct address_space *mapping,
+    struct writeback_control *wbc)
+{
+	struct orangefs_writepages *ow;
+	struct blk_plug plug;
+	int ret;
+	ow = kzalloc(sizeof(struct orangefs_writepages), GFP_KERNEL);
+	if (!ow)
+		return -ENOMEM;
+	ow->maxpages = orangefs_bufmap_size_query()/PAGE_SIZE;
+	ow->pages = kcalloc(ow->maxpages, sizeof(struct page *), GFP_KERNEL);
+	if (!ow->pages) {
+		kfree(ow);
+		return -ENOMEM;
+	}
+	ow->bv = kcalloc(ow->maxpages, sizeof(struct bio_vec), GFP_KERNEL);
+	if (!ow->bv) {
+		kfree(ow->pages);
+		kfree(ow);
+		return -ENOMEM;
+	}
+	blk_start_plug(&plug);
+	ret = write_cache_pages(mapping, wbc, orangefs_writepages_callback, ow);
+	if (ow->npages)
+		ret = orangefs_writepages_work(ow, wbc);
+	blk_finish_plug(&plug);
+	kfree(ow->pages);
+	kfree(ow->bv);
+	kfree(ow);
+	return ret;
+}
+
+static int orangefs_launder_page(struct page *);
+
+static int orangefs_readpage(struct file *file, struct page *page)
+{
+	struct inode *inode = page->mapping->host;
+	struct iov_iter iter;
+	struct bio_vec bv;
+	ssize_t ret;
+	loff_t off; /* offset into this page */
+	pgoff_t index; /* which page */
+	struct page *next_page;
+	char *kaddr;
+	loff_t read_size;
+	int buffer_index = -1; /* orangefs shared memory slot */
+	int slot_index;   /* index into slot */
+	int remaining;
+
+	/*
+	 * Get up to this many bytes from Orangefs at a time and try
+	 * to fill them into the page cache at once. Tests with dd made
+	 * this seem like a reasonable static number, if there was
+	 * interest perhaps this number could be made setable through
+	 * sysfs...
+	 */
+	read_size = 524288;
+
+	if (PageDirty(page))
+		orangefs_launder_page(page);
+
+	off = page_offset(page);
+	index = off >> PAGE_SHIFT;
+	bv.bv_page = page;
+	bv.bv_len = PAGE_SIZE;
+	bv.bv_offset = 0;
+	iov_iter_bvec(&iter, READ, &bv, 1, PAGE_SIZE);
+
+	ret = wait_for_direct_io(ORANGEFS_IO_READ, inode, &off, &iter,
+	    read_size, inode->i_size, NULL, &buffer_index, file);
+	remaining = ret;
+	/* this will only zero remaining unread portions of the page data */
+	iov_iter_zero(~0U, &iter);
+	/* takes care of potential aliasing */
+	flush_dcache_page(page);
+	if (ret < 0) {
+		SetPageError(page);
+		unlock_page(page);
+		goto out;
+	} else {
+		SetPageUptodate(page);
+		if (PageError(page))
+			ClearPageError(page);
+		ret = 0;
+	}
+	/* unlock the page after the ->readpage() routine completes */
+	unlock_page(page);
+
+	if (remaining > PAGE_SIZE) {
+		slot_index = 0;
+		while ((remaining - PAGE_SIZE) >= PAGE_SIZE) {
+			remaining -= PAGE_SIZE;
+			/*
+			 * It is an optimization to try and fill more than one
+			 * page... by now we've already gotten the single
+			 * page we were after, if stuff doesn't seem to
+			 * be going our way at this point just return
+			 * and hope for the best.
+			 *
+			 * If we look for pages and they're already there is
+			 * one reason to give up, and if they're not there
+			 * and we can't create them is another reason.
+			 */
+
+			index++;
+			slot_index++;
+			next_page = find_get_page(inode->i_mapping, index);
+			if (next_page) {
+				gossip_debug(GOSSIP_FILE_DEBUG,
+					"%s: found next page, quitting\n",
+					__func__);
+				put_page(next_page);
+				goto out;
+			}
+			next_page = find_or_create_page(inode->i_mapping,
+							index,
+							GFP_KERNEL);
+			/*
+			 * I've never hit this, leave it as a printk for
+			 * now so it will be obvious.
+			 */
+			if (!next_page) {
+				printk("%s: can't create next page, quitting\n",
+					__func__);
+				goto out;
+			}
+			kaddr = kmap_atomic(next_page);
+			orangefs_bufmap_page_fill(kaddr,
+						buffer_index,
+						slot_index);
+			kunmap_atomic(kaddr);
+			SetPageUptodate(next_page);
+			unlock_page(next_page);
+			put_page(next_page);
+		}
+	}
+
+out:
+	if (buffer_index != -1)
+		orangefs_bufmap_put(buffer_index);
+	return ret;
+}
+
+static int orangefs_write_begin(struct file *file,
+    struct address_space *mapping,
+    loff_t pos, unsigned len, unsigned flags, struct page **pagep,
+    void **fsdata)
+{
+	struct orangefs_write_range *wr;
+	struct page *page;
+	pgoff_t index;
+	int ret;
+
+	index = pos >> PAGE_SHIFT;
+
+	page = grab_cache_page_write_begin(mapping, index, flags);
+	if (!page)
+		return -ENOMEM;
+
+	*pagep = page;
+
+	if (PageDirty(page) && !PagePrivate(page)) {
+		/*
+		 * Should be impossible.  If it happens, launder the page
+		 * since we don't know what's dirty.  This will WARN in
+		 * orangefs_writepage_locked.
+		 */
+		ret = orangefs_launder_page(page);
+		if (ret)
+			return ret;
+	}
+	if (PagePrivate(page)) {
+		struct orangefs_write_range *wr;
+		wr = (struct orangefs_write_range *)page_private(page);
+		if (wr->pos + wr->len == pos &&
+		    uid_eq(wr->uid, current_fsuid()) &&
+		    gid_eq(wr->gid, current_fsgid())) {
+			wr->len += len;
+			goto okay;
+		} else {
+			ret = orangefs_launder_page(page);
+			if (ret)
+				return ret;
+		}
+	}
+
+	wr = kmalloc(sizeof *wr, GFP_KERNEL);
+	if (!wr)
+		return -ENOMEM;
+
+	wr->pos = pos;
+	wr->len = len;
+	wr->uid = current_fsuid();
+	wr->gid = current_fsgid();
+	attach_page_private(page, wr);
+okay:
+	return 0;
+}
+
+static int orangefs_write_end(struct file *file, struct address_space *mapping,
+    loff_t pos, unsigned len, unsigned copied, struct page *page, void *fsdata)
+{
+	struct inode *inode = page->mapping->host;
+	loff_t last_pos = pos + copied;
+
+	/*
+	 * No need to use i_size_read() here, the i_size
+	 * cannot change under us because we hold the i_mutex.
+	 */
+	if (last_pos > inode->i_size)
+		i_size_write(inode, last_pos);
+
+	/* zero the stale part of the page if we did a short copy */
+	if (!PageUptodate(page)) {
+		unsigned from = pos & (PAGE_SIZE - 1);
+		if (copied < len) {
+			zero_user(page, from + copied, len - copied);
+		}
+		/* Set fully written pages uptodate. */
+		if (pos == page_offset(page) &&
+		    (len == PAGE_SIZE || pos + len == inode->i_size)) {
+			zero_user_segment(page, from + copied, PAGE_SIZE);
+			SetPageUptodate(page);
+		}
+	}
+
+	set_page_dirty(page);
+	unlock_page(page);
+	put_page(page);
+
+	mark_inode_dirty_sync(file_inode(file));
+	return copied;
+}
+
+static void orangefs_invalidatepage(struct page *page,
+				 unsigned int offset,
+				 unsigned int length)
+{
+	struct orangefs_write_range *wr;
+	wr = (struct orangefs_write_range *)page_private(page);
+
+	if (offset == 0 && length == PAGE_SIZE) {
+		kfree(detach_page_private(page));
+		return;
+	/* write range entirely within invalidate range (or equal) */
+	} else if (page_offset(page) + offset <= wr->pos &&
+	    wr->pos + wr->len <= page_offset(page) + offset + length) {
+		kfree(detach_page_private(page));
+		/* XXX is this right? only caller in fs */
+		cancel_dirty_page(page);
+		return;
+	/* invalidate range chops off end of write range */
+	} else if (wr->pos < page_offset(page) + offset &&
+	    wr->pos + wr->len <= page_offset(page) + offset + length &&
+	     page_offset(page) + offset < wr->pos + wr->len) {
+		size_t x;
+		x = wr->pos + wr->len - (page_offset(page) + offset);
+		WARN_ON(x > wr->len);
+		wr->len -= x;
+		wr->uid = current_fsuid();
+		wr->gid = current_fsgid();
+	/* invalidate range chops off beginning of write range */
+	} else if (page_offset(page) + offset <= wr->pos &&
+	    page_offset(page) + offset + length < wr->pos + wr->len &&
+	    wr->pos < page_offset(page) + offset + length) {
+		size_t x;
+		x = page_offset(page) + offset + length - wr->pos;
+		WARN_ON(x > wr->len);
+		wr->pos += x;
+		wr->len -= x;
+		wr->uid = current_fsuid();
+		wr->gid = current_fsgid();
+	/* invalidate range entirely within write range (punch hole) */
+	} else if (wr->pos < page_offset(page) + offset &&
+	    page_offset(page) + offset + length < wr->pos + wr->len) {
+		/* XXX what do we do here... should not WARN_ON */
+		WARN_ON(1);
+		/* punch hole */
+		/*
+		 * should we just ignore this and write it out anyway?
+		 * it hardly makes sense
+		 */
+		return;
+	/* non-overlapping ranges */
+	} else {
+		/* WARN if they do overlap */
+		if (!((page_offset(page) + offset + length <= wr->pos) ^
+		    (wr->pos + wr->len <= page_offset(page) + offset))) {
+			WARN_ON(1);
+			printk("invalidate range offset %llu length %u\n",
+			    page_offset(page) + offset, length);
+			printk("write range offset %llu length %zu\n",
+			    wr->pos, wr->len);
+		}
+		return;
+	}
+
+	/*
+	 * Above there are returns where wr is freed or where we WARN.
+	 * Thus the following runs if wr was modified above.
+	 */
+
+	orangefs_launder_page(page);
+}
+
+static int orangefs_releasepage(struct page *page, gfp_t foo)
+{
+	return !PagePrivate(page);
+}
+
+static void orangefs_freepage(struct page *page)
+{
+	kfree(detach_page_private(page));
+}
+
+static int orangefs_launder_page(struct page *page)
+{
+	int r = 0;
+	struct writeback_control wbc = {
+		.sync_mode = WB_SYNC_ALL,
+		.nr_to_write = 0,
+	};
+	wait_on_page_writeback(page);
+	if (clear_page_dirty_for_io(page)) {
+		r = orangefs_writepage_locked(page, &wbc);
+		end_page_writeback(page);
+	}
+	return r;
+}
+
+static ssize_t orangefs_direct_IO(struct kiocb *iocb,
+				  struct iov_iter *iter)
+{
+	/*
+	 * Comment from original do_readv_writev:
+	 * Common entry point for read/write/readv/writev
+	 * This function will dispatch it to either the direct I/O
+	 * or buffered I/O path depending on the mount options and/or
+	 * augmented/extended metadata attached to the file.
+	 * Note: File extended attributes override any mount options.
+	 */
+	struct file *file = iocb->ki_filp;
+	loff_t pos = iocb->ki_pos;
+	enum ORANGEFS_io_type type = iov_iter_rw(iter) == WRITE ?
+            ORANGEFS_IO_WRITE : ORANGEFS_IO_READ;
+	loff_t *offset = &pos;
+	struct inode *inode = file->f_mapping->host;
+	struct orangefs_inode_s *orangefs_inode = ORANGEFS_I(inode);
+	struct orangefs_khandle *handle = &orangefs_inode->refn.khandle;
+	size_t count = iov_iter_count(iter);
+	ssize_t total_count = 0;
+	ssize_t ret = -EINVAL;
+	int i = 0;
+
+	gossip_debug(GOSSIP_FILE_DEBUG,
+		"%s-BEGIN(%pU): count(%d) after estimate_max_iovecs.\n",
+		__func__,
+		handle,
+		(int)count);
+
+	if (type == ORANGEFS_IO_WRITE) {
+		gossip_debug(GOSSIP_FILE_DEBUG,
+			     "%s(%pU): proceeding with offset : %llu, "
+			     "size %d\n",
+			     __func__,
+			     handle,
+			     llu(*offset),
+			     (int)count);
+	}
+
+	if (count == 0) {
+		ret = 0;
+		goto out;
+	}
+
+	while (iov_iter_count(iter)) {
+		size_t each_count = iov_iter_count(iter);
+		size_t amt_complete;
+		i++;
+
+		/* how much to transfer in this loop iteration */
+		if (each_count > orangefs_bufmap_size_query())
+			each_count = orangefs_bufmap_size_query();
+
+		gossip_debug(GOSSIP_FILE_DEBUG,
+			     "%s(%pU): size of each_count(%d)\n",
+			     __func__,
+			     handle,
+			     (int)each_count);
+		gossip_debug(GOSSIP_FILE_DEBUG,
+			     "%s(%pU): BEFORE wait_for_io: offset is %d\n",
+			     __func__,
+			     handle,
+			     (int)*offset);
+
+		ret = wait_for_direct_io(type, inode, offset, iter,
+				each_count, 0, NULL, NULL, file);
+		gossip_debug(GOSSIP_FILE_DEBUG,
+			     "%s(%pU): return from wait_for_io:%d\n",
+			     __func__,
+			     handle,
+			     (int)ret);
+
+		if (ret < 0)
+			goto out;
+
+		*offset += ret;
+		total_count += ret;
+		amt_complete = ret;
+
+		gossip_debug(GOSSIP_FILE_DEBUG,
+			     "%s(%pU): AFTER wait_for_io: offset is %d\n",
+			     __func__,
+			     handle,
+			     (int)*offset);
+
+		/*
+		 * if we got a short I/O operations,
+		 * fall out and return what we got so far
+		 */
+		if (amt_complete < each_count)
+			break;
+	} /*end while */
+
+out:
+	if (total_count > 0)
+		ret = total_count;
+	if (ret > 0) {
+		if (type == ORANGEFS_IO_READ) {
+			file_accessed(file);
+		} else {
+			file_update_time(file);
+			if (*offset > i_size_read(inode))
+				i_size_write(inode, *offset);
+		}
+	}
+
+	gossip_debug(GOSSIP_FILE_DEBUG,
+		     "%s(%pU): Value(%d) returned.\n",
+		     __func__,
+		     handle,
+		     (int)ret);
+
+	return ret;
+}
+
+/** ORANGEFS2 implementation of address space operations */
+static const struct address_space_operations orangefs_address_operations = {
+	.writepage = orangefs_writepage,
+	.readpage = orangefs_readpage,
+	.writepages = orangefs_writepages,
+	.set_page_dirty = __set_page_dirty_nobuffers,
+	.write_begin = orangefs_write_begin,
+	.write_end = orangefs_write_end,
+	.invalidatepage = orangefs_invalidatepage,
+	.releasepage = orangefs_releasepage,
+	.freepage = orangefs_freepage,
+	.launder_page = orangefs_launder_page,
+	.direct_IO = orangefs_direct_IO,
+};
+
+vm_fault_t orangefs_page_mkwrite(struct vm_fault *vmf)
+{
+	struct page *page = vmf->page;
+	struct inode *inode = file_inode(vmf->vma->vm_file);
+	struct orangefs_inode_s *orangefs_inode = ORANGEFS_I(inode);
+	unsigned long *bitlock = &orangefs_inode->bitlock;
+	vm_fault_t ret;
+	struct orangefs_write_range *wr;
+
+	sb_start_pagefault(inode->i_sb);
+
+	if (wait_on_bit(bitlock, 1, TASK_KILLABLE)) {
+		ret = VM_FAULT_RETRY;
+		goto out;
+	}
+
+	lock_page(page);
+	if (PageDirty(page) && !PagePrivate(page)) {
+		/*
+		 * Should be impossible.  If it happens, launder the page
+		 * since we don't know what's dirty.  This will WARN in
+		 * orangefs_writepage_locked.
+		 */
+		if (orangefs_launder_page(page)) {
+			ret = VM_FAULT_LOCKED|VM_FAULT_RETRY;
+			goto out;
+		}
+	}
+	if (PagePrivate(page)) {
+		wr = (struct orangefs_write_range *)page_private(page);
+		if (uid_eq(wr->uid, current_fsuid()) &&
+		    gid_eq(wr->gid, current_fsgid())) {
+			wr->pos = page_offset(page);
+			wr->len = PAGE_SIZE;
+			goto okay;
+		} else {
+			if (orangefs_launder_page(page)) {
+				ret = VM_FAULT_LOCKED|VM_FAULT_RETRY;
+				goto out;
+			}
+		}
+	}
+	wr = kmalloc(sizeof *wr, GFP_KERNEL);
+	if (!wr) {
+		ret = VM_FAULT_LOCKED|VM_FAULT_RETRY;
+		goto out;
+	}
+	wr->pos = page_offset(page);
+	wr->len = PAGE_SIZE;
+	wr->uid = current_fsuid();
+	wr->gid = current_fsgid();
+	attach_page_private(page, wr);
+okay:
+
+	file_update_time(vmf->vma->vm_file);
+	if (page->mapping != inode->i_mapping) {
+		unlock_page(page);
+		ret = VM_FAULT_LOCKED|VM_FAULT_NOPAGE;
+		goto out;
+	}
+
+	/*
+	 * We mark the page dirty already here so that when freeze is in
+	 * progress, we are guaranteed that writeback during freezing will
+	 * see the dirty page and writeprotect it again.
+	 */
+	set_page_dirty(page);
+	wait_for_stable_page(page);
+	ret = VM_FAULT_LOCKED;
+out:
+	sb_end_pagefault(inode->i_sb);
+	return ret;
+}
+
+static int orangefs_setattr_size(struct inode *inode, struct iattr *iattr)
+{
+	struct orangefs_inode_s *orangefs_inode = ORANGEFS_I(inode);
+	struct orangefs_kernel_op_s *new_op;
+	loff_t orig_size;
+	int ret = -EINVAL;
+
+	gossip_debug(GOSSIP_INODE_DEBUG,
+		     "%s: %pU: Handle is %pU | fs_id %d | size is %llu\n",
+		     __func__,
+		     get_khandle_from_ino(inode),
+		     &orangefs_inode->refn.khandle,
+		     orangefs_inode->refn.fs_id,
+		     iattr->ia_size);
+
+	/* Ensure that we have a up to date size, so we know if it changed. */
+	ret = orangefs_inode_getattr(inode, ORANGEFS_GETATTR_SIZE);
+	if (ret == -ESTALE)
+		ret = -EIO;
+	if (ret) {
+		gossip_err("%s: orangefs_inode_getattr failed, ret:%d:.\n",
+		    __func__, ret);
+		return ret;
+	}
+	orig_size = i_size_read(inode);
+
+	/* This is truncate_setsize in a different order. */
+	truncate_pagecache(inode, iattr->ia_size);
+	i_size_write(inode, iattr->ia_size);
+	if (iattr->ia_size > orig_size)
+		pagecache_isize_extended(inode, orig_size, iattr->ia_size);
+
+	new_op = op_alloc(ORANGEFS_VFS_OP_TRUNCATE);
+	if (!new_op)
+		return -ENOMEM;
+
+	new_op->upcall.req.truncate.refn = orangefs_inode->refn;
+	new_op->upcall.req.truncate.size = (__s64) iattr->ia_size;
+
+	ret = service_operation(new_op,
+		__func__,
+		get_interruptible_flag(inode));
+
+	/*
+	 * the truncate has no downcall members to retrieve, but
+	 * the status value tells us if it went through ok or not
+	 */
+	gossip_debug(GOSSIP_INODE_DEBUG, "%s: ret:%d:\n", __func__, ret);
+
+	op_release(new_op);
+
+	if (ret != 0)
+		return ret;
+
+	if (orig_size != i_size_read(inode))
+		iattr->ia_valid |= ATTR_CTIME | ATTR_MTIME;
+
+	return ret;
+}
+
+int __orangefs_setattr(struct inode *inode, struct iattr *iattr)
+{
+	int ret;
+
+	if (iattr->ia_valid & ATTR_MODE) {
+		if (iattr->ia_mode & (S_ISVTX)) {
+			if (is_root_handle(inode)) {
+				/*
+				 * allow sticky bit to be set on root (since
+				 * it shows up that way by default anyhow),
+				 * but don't show it to the server
+				 */
+				iattr->ia_mode -= S_ISVTX;
+			} else {
+				gossip_debug(GOSSIP_UTILS_DEBUG,
+					     "User attempted to set sticky bit on non-root directory; returning EINVAL.\n");
+				ret = -EINVAL;
+				goto out;
+			}
+		}
+		if (iattr->ia_mode & (S_ISUID)) {
+			gossip_debug(GOSSIP_UTILS_DEBUG,
+				     "Attempting to set setuid bit (not supported); returning EINVAL.\n");
+			ret = -EINVAL;
+			goto out;
+		}
+	}
+
+	if (iattr->ia_valid & ATTR_SIZE) {
+		ret = orangefs_setattr_size(inode, iattr);
+		if (ret)
+			goto out;
+	}
+
+again:
+	spin_lock(&inode->i_lock);
+	if (ORANGEFS_I(inode)->attr_valid) {
+		if (uid_eq(ORANGEFS_I(inode)->attr_uid, current_fsuid()) &&
+		    gid_eq(ORANGEFS_I(inode)->attr_gid, current_fsgid())) {
+			ORANGEFS_I(inode)->attr_valid = iattr->ia_valid;
+		} else {
+			spin_unlock(&inode->i_lock);
+			write_inode_now(inode, 1);
+			goto again;
+		}
+	} else {
+		ORANGEFS_I(inode)->attr_valid = iattr->ia_valid;
+		ORANGEFS_I(inode)->attr_uid = current_fsuid();
+		ORANGEFS_I(inode)->attr_gid = current_fsgid();
+	}
+	setattr_copy(inode, iattr);
+	spin_unlock(&inode->i_lock);
+	mark_inode_dirty(inode);
+
+	if (iattr->ia_valid & ATTR_MODE)
+		/* change mod on a file that has ACLs */
+		ret = posix_acl_chmod(inode, inode->i_mode);
+
+	ret = 0;
+out:
+	return ret;
+}
+
+/*
+ * Change attributes of an object referenced by dentry.
+ */
+int orangefs_setattr(struct dentry *dentry, struct iattr *iattr)
+{
+	int ret;
+	gossip_debug(GOSSIP_INODE_DEBUG, "__orangefs_setattr: called on %pd\n",
+	    dentry);
+	ret = setattr_prepare(dentry, iattr);
+	if (ret)
+	        goto out;
+	ret = __orangefs_setattr(d_inode(dentry), iattr);
+	sync_inode_metadata(d_inode(dentry), 1);
+out:
+	gossip_debug(GOSSIP_INODE_DEBUG, "orangefs_setattr: returning %d\n",
+	    ret);
+	return ret;
+}
+
+/*
+ * Obtain attributes of an object given a dentry
+ */
+int orangefs_getattr(const struct path *path, struct kstat *stat,
+		     u32 request_mask, unsigned int flags)
+{
+	int ret;
+	struct inode *inode = path->dentry->d_inode;
+
+	gossip_debug(GOSSIP_INODE_DEBUG,
+		     "orangefs_getattr: called on %pd mask %u\n",
+		     path->dentry, request_mask);
+
+	ret = orangefs_inode_getattr(inode,
+	    request_mask & STATX_SIZE ? ORANGEFS_GETATTR_SIZE : 0);
+	if (ret == 0) {
+		generic_fillattr(inode, stat);
+
+		/* override block size reported to stat */
+		if (!(request_mask & STATX_SIZE))
+			stat->result_mask &= ~STATX_SIZE;
+
+		stat->attributes_mask = STATX_ATTR_IMMUTABLE |
+		    STATX_ATTR_APPEND;
+		if (inode->i_flags & S_IMMUTABLE)
+			stat->attributes |= STATX_ATTR_IMMUTABLE;
+		if (inode->i_flags & S_APPEND)
+			stat->attributes |= STATX_ATTR_APPEND;
+	}
+	return ret;
+}
+
+int orangefs_permission(struct inode *inode, int mask)
+{
+	int ret;
+
+	if (mask & MAY_NOT_BLOCK)
+		return -ECHILD;
+
+	gossip_debug(GOSSIP_INODE_DEBUG, "%s: refreshing\n", __func__);
+
+	/* Make sure the permission (and other common attrs) are up to date. */
+	ret = orangefs_inode_getattr(inode, 0);
+	if (ret < 0)
+		return ret;
+
+	return generic_permission(inode, mask);
+}
+
+int orangefs_update_time(struct inode *inode, struct timespec64 *time, int flags)
+{
+	struct iattr iattr;
+	gossip_debug(GOSSIP_INODE_DEBUG, "orangefs_update_time: %pU\n",
+	    get_khandle_from_ino(inode));
+	generic_update_time(inode, time, flags);
+	memset(&iattr, 0, sizeof iattr);
+        if (flags & S_ATIME)
+		iattr.ia_valid |= ATTR_ATIME;
+	if (flags & S_CTIME)
+		iattr.ia_valid |= ATTR_CTIME;
+	if (flags & S_MTIME)
+		iattr.ia_valid |= ATTR_MTIME;
+	return __orangefs_setattr(inode, &iattr);
+}
+
+/* ORANGEFS2 implementation of VFS inode operations for files */
+static const struct inode_operations orangefs_file_inode_operations = {
+	.get_acl = orangefs_get_acl,
+	.set_acl = orangefs_set_acl,
+	.setattr = orangefs_setattr,
+	.getattr = orangefs_getattr,
+	.listxattr = orangefs_listxattr,
+	.permission = orangefs_permission,
+	.update_time = orangefs_update_time,
+};
+
+static int orangefs_init_iops(struct inode *inode)
+{
+	inode->i_mapping->a_ops = &orangefs_address_operations;
+
+	switch (inode->i_mode & S_IFMT) {
+	case S_IFREG:
+		inode->i_op = &orangefs_file_inode_operations;
+		inode->i_fop = &orangefs_file_operations;
+		break;
+	case S_IFLNK:
+		inode->i_op = &orangefs_symlink_inode_operations;
+		break;
+	case S_IFDIR:
+		inode->i_op = &orangefs_dir_inode_operations;
+		inode->i_fop = &orangefs_dir_operations;
+		break;
+	default:
+		gossip_debug(GOSSIP_INODE_DEBUG,
+			     "%s: unsupported mode\n",
+			     __func__);
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+/*
+ * Given an ORANGEFS object identifier (fsid, handle), convert it into
+ * a ino_t type that will be used as a hash-index from where the handle will
+ * be searched for in the VFS hash table of inodes.
+ */
+static inline ino_t orangefs_handle_hash(struct orangefs_object_kref *ref)
+{
+	if (!ref)
+		return 0;
+	return orangefs_khandle_to_ino(&(ref->khandle));
+}
+
+/*
+ * Called to set up an inode from iget5_locked.
+ */
+static int orangefs_set_inode(struct inode *inode, void *data)
+{
+	struct orangefs_object_kref *ref = (struct orangefs_object_kref *) data;
+	ORANGEFS_I(inode)->refn.fs_id = ref->fs_id;
+	ORANGEFS_I(inode)->refn.khandle = ref->khandle;
+	ORANGEFS_I(inode)->attr_valid = 0;
+	hash_init(ORANGEFS_I(inode)->xattr_cache);
+	ORANGEFS_I(inode)->mapping_time = jiffies - 1;
+	ORANGEFS_I(inode)->bitlock = 0;
+	return 0;
+}
+
+/*
+ * Called to determine if handles match.
+ */
+static int orangefs_test_inode(struct inode *inode, void *data)
+{
+	struct orangefs_object_kref *ref = (struct orangefs_object_kref *) data;
+	struct orangefs_inode_s *orangefs_inode = NULL;
+
+	orangefs_inode = ORANGEFS_I(inode);
+	/* test handles and fs_ids... */
+	return (!ORANGEFS_khandle_cmp(&(orangefs_inode->refn.khandle),
+				&(ref->khandle)) &&
+			orangefs_inode->refn.fs_id == ref->fs_id);
+}
+
+/*
+ * Front-end to lookup the inode-cache maintained by the VFS using the ORANGEFS
+ * file handle.
+ *
+ * @sb: the file system super block instance.
+ * @ref: The ORANGEFS object for which we are trying to locate an inode.
+ */
+struct inode *orangefs_iget(struct super_block *sb,
+		struct orangefs_object_kref *ref)
+{
+	struct inode *inode = NULL;
+	unsigned long hash;
+	int error;
+
+	hash = orangefs_handle_hash(ref);
+	inode = iget5_locked(sb,
+			hash,
+			orangefs_test_inode,
+			orangefs_set_inode,
+			ref);
+
+	if (!inode)
+		return ERR_PTR(-ENOMEM);
+
+	if (!(inode->i_state & I_NEW))
+		return inode;
+
+	error = orangefs_inode_getattr(inode, ORANGEFS_GETATTR_NEW);
+	if (error) {
+		iget_failed(inode);
+		return ERR_PTR(error);
+	}
+
+	inode->i_ino = hash;	/* needed for stat etc */
+	orangefs_init_iops(inode);
+	unlock_new_inode(inode);
+
+	gossip_debug(GOSSIP_INODE_DEBUG,
+		     "iget handle %pU, fsid %d hash %ld i_ino %lu\n",
+		     &ref->khandle,
+		     ref->fs_id,
+		     hash,
+		     inode->i_ino);
+
+	return inode;
+}
+
+/*
+ * Allocate an inode for a newly created file and insert it into the inode hash.
+ */
+struct inode *orangefs_new_inode(struct super_block *sb, struct inode *dir,
+		int mode, dev_t dev, struct orangefs_object_kref *ref)
+{
+	unsigned long hash = orangefs_handle_hash(ref);
+	struct inode *inode;
+	int error;
+
+	gossip_debug(GOSSIP_INODE_DEBUG,
+		     "%s:(sb is %p | MAJOR(dev)=%u | MINOR(dev)=%u mode=%o)\n",
+		     __func__,
+		     sb,
+		     MAJOR(dev),
+		     MINOR(dev),
+		     mode);
+
+	inode = new_inode(sb);
+	if (!inode)
+		return ERR_PTR(-ENOMEM);
+
+	orangefs_set_inode(inode, ref);
+	inode->i_ino = hash;	/* needed for stat etc */
+
+	error = orangefs_inode_getattr(inode, ORANGEFS_GETATTR_NEW);
+	if (error)
+		goto out_iput;
+
+	orangefs_init_iops(inode);
+	inode->i_rdev = dev;
+
+	error = insert_inode_locked4(inode, hash, orangefs_test_inode, ref);
+	if (error < 0)
+		goto out_iput;
+
+	gossip_debug(GOSSIP_INODE_DEBUG,
+		     "Initializing ACL's for inode %pU\n",
+		     get_khandle_from_ino(inode));
+	orangefs_init_acl(inode, dir);
+	return inode;
+
+out_iput:
+	iput(inode);
+	return ERR_PTR(error);
+}