[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 "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 err;

	BUG_ON(inode != dentry->d_inode);
	/*
	 * 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);
	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;
		}
	}
	iput(inode);
	if (inode != dentry->d_inode)
		goto out_drop;

	nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
	nfs_file_set_open_context(filp, ctx);
	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->f_path.dentry->d_inode;

	ret = filemap_write_and_wait_range(inode->i_mapping, start, end);
	if (ret != 0)
		goto out;
	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);
out:
	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"
	8	#include "pnfs.h"
	9
	10	#define NFSDBG_FACILITY NFSDBG_FILE
	11
	12	static int
	13	nfs4_file_open(struct inode inode, struct file filp)
	14	{
	15	struct nfs_open_context *ctx;
	16	struct dentry *dentry = filp->f_path.dentry;
	17	struct dentry *parent = NULL;
	18	struct inode *dir;
	19	unsigned openflags = filp->f_flags;
	20	struct iattr attr;
	21	int err;
	22
	23	BUG_ON(inode != dentry->d_inode);
	24	/*
	25	* If no cached dentry exists or if it's negative, NFSv4 handled the
	26	* opens in ->lookup() or ->create().
	27	*
	28	* We only get this far for a cached positive dentry. We skipped
	29	* revalidation, so handle it here by dropping the dentry and returning
	30	* -EOPENSTALE. The VFS will retry the lookup/create/open.
	31	*/
	32
	33	dprintk("NFS: open file(%s/%s)\n",
	34	dentry->d_parent->d_name.name,
	35	dentry->d_name.name);
	36
	37	if ((openflags & O_ACCMODE) == 3)
	38	openflags--;
	39
	40	/* We can't create new files here */
	41	openflags &= ~(O_CREAT\|O_EXCL);
	42
	43	parent = dget_parent(dentry);
	44	dir = parent->d_inode;
	45
	46	ctx = alloc_nfs_open_context(filp->f_path.dentry, filp->f_mode);
	47	err = PTR_ERR(ctx);
	48	if (IS_ERR(ctx))
	49	goto out;
	50
	51	attr.ia_valid = ATTR_OPEN;
	52	if (openflags & O_TRUNC) {
	53	attr.ia_valid \|= ATTR_SIZE;
	54	attr.ia_size = 0;
	55	nfs_wb_all(inode);
	56	}
	57
	58	inode = NFS_PROTO(dir)->open_context(dir, ctx, openflags, &attr);
	59	if (IS_ERR(inode)) {
	60	err = PTR_ERR(inode);
	61	switch (err) {
	62	case -EPERM:
	63	case -EACCES:
	64	case -EDQUOT:
65	case -ENOSPC:
66	case -EROFS:
67	goto out_put_ctx;
68	default:
69	goto out_drop;
70	}
71	}
72	iput(inode);
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);
78	err = 0;
79
80	out_put_ctx:
81	put_nfs_open_context(ctx);
82	out:
83	dput(parent);
84	return err;
85
86	out_drop:
87	d_drop(dentry);
88	err = -EOPENSTALE;
89	goto out_put_ctx;
90	}
91
92	static int
93	nfs4_file_fsync(struct file *file, loff_t start, loff_t end, int datasync)
94	{
95	int ret;
96	struct inode *inode = file->f_path.dentry->d_inode;
97
98	ret = filemap_write_and_wait_range(inode->i_mapping, start, end);
7b281ee0 TM	99	if (ret != 0)
7b281ee0 TM	100	goto out;
ce4ef7c0 BS	101	mutex_lock(&inode->i_mutex);
	102	ret = nfs_file_fsync_commit(file, start, end, datasync);
	103	if (!ret && !datasync)
	104	/* application has asked for meta-data sync */
	105	ret = pnfs_layoutcommit_inode(inode, true);
	106	mutex_unlock(&inode->i_mutex);
7b281ee0	107	out:
ce4ef7c0 BS	108	return ret;
	109	}
	110
	111	const struct file_operations nfs4_file_operations = {
	112	.llseek = nfs_file_llseek,
	113	.read = do_sync_read,
	114	.write = do_sync_write,
	115	.aio_read = nfs_file_read,
	116	.aio_write = nfs_file_write,
	117	.mmap = nfs_file_mmap,
	118	.open = nfs4_file_open,
	119	.flush = nfs_file_flush,
	120	.release = nfs_file_release,
	121	.fsync = nfs4_file_fsync,
	122	.lock = nfs_lock,
	123	.flock = nfs_flock,
	124	.splice_read = nfs_file_splice_read,
	125	.splice_write = nfs_file_splice_write,
	126	.check_flags = nfs_check_flags,
	127	.setlease = nfs_setlease,
	128	};