[deliverable/linux.git] / fs / nfs / nfs4file.c

/*
 *  linux/fs/nfs/file.c
 *
 *  Copyright (C) 1992  Rick Sladkey
 */
#include <linux/nfs_fs.h>
#include "internal.h"
#include "fscache.h"
#include "pnfs.h"

#define NFSDBG_FACILITY		NFSDBG_FILE

static int
nfs4_file_open(struct inode *inode, struct file *filp)
{
	struct nfs_open_context *ctx;
	struct dentry *dentry = filp->f_path.dentry;
	struct dentry *parent = NULL;
	struct inode *dir;
	unsigned openflags = filp->f_flags;
	struct iattr attr;
	int opened = 0;
	int err;

	/*
	 * If no cached dentry exists or if it's negative, NFSv4 handled the
	 * opens in ->lookup() or ->create().
	 *
	 * We only get this far for a cached positive dentry.  We skipped
	 * revalidation, so handle it here by dropping the dentry and returning
	 * -EOPENSTALE.  The VFS will retry the lookup/create/open.
	 */

	dprintk("NFS: open file(%s/%s)\n",
		dentry->d_parent->d_name.name,
		dentry->d_name.name);

	if ((openflags & O_ACCMODE) == 3)
		openflags--;

	/* We can't create new files here */
	openflags &= ~(O_CREAT|O_EXCL);

	parent = dget_parent(dentry);
	dir = parent->d_inode;

	ctx = alloc_nfs_open_context(filp->f_path.dentry, filp->f_mode);
	err = PTR_ERR(ctx);
	if (IS_ERR(ctx))
		goto out;

	attr.ia_valid = ATTR_OPEN;
	if (openflags & O_TRUNC) {
		attr.ia_valid |= ATTR_SIZE;
		attr.ia_size = 0;
		nfs_wb_all(inode);
	}

	inode = NFS_PROTO(dir)->open_context(dir, ctx, openflags, &attr, &opened);
	if (IS_ERR(inode)) {
		err = PTR_ERR(inode);
		switch (err) {
		case -EPERM:
		case -EACCES:
		case -EDQUOT:
		case -ENOSPC:
		case -EROFS:
			goto out_put_ctx;
		default:
			goto out_drop;
		}
	}
	if (inode != dentry->d_inode)
		goto out_drop;

	nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
	nfs_file_set_open_context(filp, ctx);
	nfs_fscache_set_inode_cookie(inode, filp);
	err = 0;

out_put_ctx:
	put_nfs_open_context(ctx);
out:
	dput(parent);
	return err;

out_drop:
	d_drop(dentry);
	err = -EOPENSTALE;
	goto out_put_ctx;
}

static int
nfs4_file_fsync(struct file *file, loff_t start, loff_t end, int datasync)
{
	int ret;
	struct inode *inode = file_inode(file);

	do {
		ret = filemap_write_and_wait_range(inode->i_mapping, start, end);
		if (ret != 0)
			break;
		mutex_lock(&inode->i_mutex);
		ret = nfs_file_fsync_commit(file, start, end, datasync);
		if (!ret && !datasync)
			/* application has asked for meta-data sync */
			ret = pnfs_layoutcommit_inode(inode, true);
		mutex_unlock(&inode->i_mutex);
		/*
		 * If nfs_file_fsync_commit detected a server reboot, then
		 * resend all dirty pages that might have been covered by
		 * the NFS_CONTEXT_RESEND_WRITES flag
		 */
		start = 0;
		end = LLONG_MAX;
	} while (ret == -EAGAIN);

	return ret;
}

const struct file_operations nfs4_file_operations = {
	.llseek		= nfs_file_llseek,
	.read		= do_sync_read,
	.write		= do_sync_write,
	.aio_read	= nfs_file_read,
	.aio_write	= nfs_file_write,
	.mmap		= nfs_file_mmap,
	.open		= nfs4_file_open,
	.flush		= nfs_file_flush,
	.release	= nfs_file_release,
	.fsync		= nfs4_file_fsync,
	.lock		= nfs_lock,
	.flock		= nfs_flock,
	.splice_read	= nfs_file_splice_read,
	.splice_write	= nfs_file_splice_write,
	.check_flags	= nfs_check_flags,
	.setlease	= nfs_setlease,
};
Commit	Line	Data
ce4ef7c0 BS	1	/*
	2	* linux/fs/nfs/file.c
	3	*
	4	* Copyright (C) 1992 Rick Sladkey
	5	*/
	6	#include <linux/nfs_fs.h>
	7	#include "internal.h"
a4ff1468	8	#include "fscache.h"
ce4ef7c0 BS	9	#include "pnfs.h"
	10
	11	#define NFSDBG_FACILITY NFSDBG_FILE
	12
	13	static int
	14	nfs4_file_open(struct inode inode, struct file filp)
	15	{
	16	struct nfs_open_context *ctx;
	17	struct dentry *dentry = filp->f_path.dentry;
	18	struct dentry *parent = NULL;
	19	struct inode *dir;
	20	unsigned openflags = filp->f_flags;
	21	struct iattr attr;
5bc2afc2	22	int opened = 0;
ce4ef7c0 BS	23	int err;
ce4ef7c0 BS	24
ce4ef7c0 BS	25	/*
	26	* If no cached dentry exists or if it's negative, NFSv4 handled the
	27	* opens in ->lookup() or ->create().
	28	*
	29	* We only get this far for a cached positive dentry. We skipped
	30	* revalidation, so handle it here by dropping the dentry and returning
	31	* -EOPENSTALE. The VFS will retry the lookup/create/open.
	32	*/
	33
	34	dprintk("NFS: open file(%s/%s)\n",
	35	dentry->d_parent->d_name.name,
	36	dentry->d_name.name);
	37
	38	if ((openflags & O_ACCMODE) == 3)
	39	openflags--;
	40
	41	/* We can't create new files here */
	42	openflags &= ~(O_CREAT\|O_EXCL);
	43
	44	parent = dget_parent(dentry);
	45	dir = parent->d_inode;
	46
	47	ctx = alloc_nfs_open_context(filp->f_path.dentry, filp->f_mode);
	48	err = PTR_ERR(ctx);
	49	if (IS_ERR(ctx))
	50	goto out;
	51
	52	attr.ia_valid = ATTR_OPEN;
	53	if (openflags & O_TRUNC) {
	54	attr.ia_valid \|= ATTR_SIZE;
	55	attr.ia_size = 0;
	56	nfs_wb_all(inode);
	57	}
	58
5bc2afc2	59	inode = NFS_PROTO(dir)->open_context(dir, ctx, openflags, &attr, &opened);
ce4ef7c0 BS	60	if (IS_ERR(inode)) {
	61	err = PTR_ERR(inode);
	62	switch (err) {
	63	case -EPERM:
	64	case -EACCES:
	65	case -EDQUOT:
	66	case -ENOSPC:
	67	case -EROFS:
	68	goto out_put_ctx;
	69	default:
	70	goto out_drop;
	71	}
	72	}
ce4ef7c0 BS	73	if (inode != dentry->d_inode)
	74	goto out_drop;
	75
	76	nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
	77	nfs_file_set_open_context(filp, ctx);
a4ff1468	78	nfs_fscache_set_inode_cookie(inode, filp);
ce4ef7c0 BS	79	err = 0;
	80
	81	out_put_ctx:
	82	put_nfs_open_context(ctx);
	83	out:
	84	dput(parent);
	85	return err;
	86
	87	out_drop:
	88	d_drop(dentry);
	89	err = -EOPENSTALE;
	90	goto out_put_ctx;
	91	}
	92
	93	static int
	94	nfs4_file_fsync(struct file *file, loff_t start, loff_t end, int datasync)
	95	{
	96	int ret;
496ad9aa	97	struct inode *inode = file_inode(file);
ce4ef7c0	98
05990d1b TM	99	do {
	100	ret = filemap_write_and_wait_range(inode->i_mapping, start, end);
	101	if (ret != 0)
	102	break;
	103	mutex_lock(&inode->i_mutex);
	104	ret = nfs_file_fsync_commit(file, start, end, datasync);
	105	if (!ret && !datasync)
	106	/* application has asked for meta-data sync */
	107	ret = pnfs_layoutcommit_inode(inode, true);
	108	mutex_unlock(&inode->i_mutex);
dcfc4f25 TM	109	/*
	110	* If nfs_file_fsync_commit detected a server reboot, then
	111	* resend all dirty pages that might have been covered by
	112	* the NFS_CONTEXT_RESEND_WRITES flag
	113	*/
	114	start = 0;
	115	end = LLONG_MAX;
05990d1b TM	116	} while (ret == -EAGAIN);
05990d1b TM	117
ce4ef7c0 BS	118	return ret;
	119	}
	120
	121	const struct file_operations nfs4_file_operations = {
	122	.llseek = nfs_file_llseek,
	123	.read = do_sync_read,
	124	.write = do_sync_write,
	125	.aio_read = nfs_file_read,
	126	.aio_write = nfs_file_write,
	127	.mmap = nfs_file_mmap,
	128	.open = nfs4_file_open,
	129	.flush = nfs_file_flush,
	130	.release = nfs_file_release,
	131	.fsync = nfs4_file_fsync,
	132	.lock = nfs_lock,
	133	.flock = nfs_flock,
	134	.splice_read = nfs_file_splice_read,
	135	.splice_write = nfs_file_splice_write,
	136	.check_flags = nfs_check_flags,
	137	.setlease = nfs_setlease,
	138	};