Commit 2197e9b0 authored by Trond Myklebust's avatar Trond Myklebust Committed by Anna Schumaker
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NFS: Fix up fsync() when the server rebooted 



Don't clear the NFS_CONTEXT_RESEND_WRITES flag until after calling
nfs_commit_inode(). Otherwise, if nfs_commit_inode() returns an
error, we end up with dirty pages in the page cache, but no tag
to tell us that those pages need resending.

Signed-off-by: default avatarTrond Myklebust <trond.myklebust@hammerspace.com>
Signed-off-by: default avatarAnna Schumaker <Anna.Schumaker@Netapp.com>
parent b32d2855

fs/nfs/file.c

+16 −21
Original line number Diff line number Diff line
@@ -204,44 +204,39 @@ EXPORT_SYMBOL_GPL(nfs_file_mmap); 
static int

nfs_file_fsync_commit(struct file *file, int datasync)

{

	struct nfs_open_context *ctx = nfs_file_open_context(file);

	struct inode *inode = file_inode(file);

	int do_resend, status;

	int ret = 0;

	int ret;



	dprintk("NFS: fsync file(%pD2) datasync %d\n", file, datasync);



	nfs_inc_stats(inode, NFSIOS_VFSFSYNC);

	do_resend = test_and_clear_bit(NFS_CONTEXT_RESEND_WRITES, &ctx->flags);

	status = nfs_commit_inode(inode, FLUSH_SYNC);

	if (status == 0)

		status = file_check_and_advance_wb_err(file);

	if (status < 0) {

		ret = status;

		goto out;

	}

	do_resend |= test_bit(NFS_CONTEXT_RESEND_WRITES, &ctx->flags);

	if (do_resend)

		ret = -EAGAIN;

out:

	ret = nfs_commit_inode(inode, FLUSH_SYNC);

	if (ret < 0)

		return ret;

	return file_check_and_advance_wb_err(file);

}



int

nfs_file_fsync(struct file *file, loff_t start, loff_t end, int datasync)

{

	int ret;

	struct nfs_open_context *ctx = nfs_file_open_context(file);

	struct inode *inode = file_inode(file);

	int ret;



	trace_nfs_fsync_enter(inode);



	do {

	for (;;) {

		ret = file_write_and_wait_range(file, start, end);

		if (ret != 0)

			break;

		ret = nfs_file_fsync_commit(file, datasync);

		if (!ret)

		if (ret != 0)

			break;

		ret = pnfs_sync_inode(inode, !!datasync);

		if (ret != 0)

			break;

		if (!test_and_clear_bit(NFS_CONTEXT_RESEND_WRITES, &ctx->flags))

			break;

		/*

		 * If nfs_file_fsync_commit detected a server reboot, then

		 * resend all dirty pages that might have been covered by
@@ -249,7 +244,7 @@ nfs_file_fsync(struct file *file, loff_t start, loff_t end, int datasync) 
		 */

		start = 0;

		end = LLONG_MAX;

	} while (ret == -EAGAIN);

	}



	trace_nfs_fsync_exit(inode, ret);

	return ret;

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